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Glossary of Block 1 - Gross Dissector

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Located on the posterior aspect of the occipital bone of the skull?
External Occipital Protuberance
Midline of Neck and Back?
Vertebral Furrow
First vertebral spine palpable?
C7: Vertebral Prominens
Vertebral Furrow is deepest where?
Thoracic and lumbar regions
Vertebral Furrow ends where?
Sacrum
Bi-lateral from the superior part of the sacrum is the _____________.
Iliac Crest
The highest point of the iliac crest is at what vertebral level?
L4 (Used as a surface reference for lumbar punctures)
The lateral most aspect of the shoulder?
Acromion of the Scapula
The acromion articulates with the ______.
Lateral end of the clavicle
The acromion continues postero-medially as the ____________.
Spine of the Scapula
The spine of the scapula is at what vertebral level?
T3
The inferior angle of the scapula is at what vertebral level?
T7
What makes up the posterior axillary fold?
Lower border of the Latissimus Dorsi and Teres Major
Cutaneous Nerves to the skin of the back are branches of the _____________.
Dorsal rami of the spinal nerves
# of pairs of spinal nerves?
31 pairs
The superficial group of muscles is composed of?
5 Muscles: Trapezius Latissimus Dorsi Levator Scapulae Rhomboid Minor and Rhomboid Major
The superficial group functionally contributes to the ___________.
Upper Limb
What muscles of the back cover most of the surface?
Trapezius and Latissimus Dorsi
Origin: Trapezius
External Occipital Protuberance ligamentum nuchae and C7-T12
Insertion: Trapezius
Lateral end of clavicle acromion and scapular spine
What artery and nerve lie deep to the lateral portion of the Trapezius?
Transverse Cervical Artery (& Vein) and Subtrapezial Nerve Plexus
Subtrapezial Nerve Plexus is formed by ___.
Accessory Nerve (CN XI) and the 3rd and 4th cervical spinal nerves
Latissimus Dorsi is (superficial/deep) to Trapezius?
Deep
What are the borders of the Triangle of Ascultation?
Superior: Rhomboid Major. Medially: Trapezius. Laterally: Medial border of Scapula. Inferiorly: Latissimus Dorsi
Where does Latissimus Dorsi cross the Scapula?
At the inferior angle of the scapula
The Latissimus Dorsi muscle fibers interdigitate with those of _________.
External Abdominal Oblique and Serratus Anterior Muscles
What muscle does the lateral and superior border of the Latissimus Dorsi wrap around?
Teres Major
What do the Latissimus Dorsi and Teres Major form together?
Posterior Axillary Fold
Latissimus Dorsi: origin blood supply and insertion
Thoracodorsal Nerve (Posterior Cord of Brachial Plexus) Thoracodorsal Artery (Branch of Subscapular Artery III) Intertubercular Groove of humerus
Insertion: Serratus Anterior
Ventral surface of the medial border of the Scapula
Action: Serratus Anterior
Holds scapula against posterior chest wall and rotates the scapula superiorly
Innervation: Serratus Anterior
Long Thoracic Nerve (C5 C6 C7)
Clinical: Paralysis of Long Thoracic Nerve
Winged Scapula
Consists of what muscles?
Posterior Superior Serratus. Posterior Inferior Serratus
Innervation?
Intercostal Nerves
Function of Middle Group of Back Muscles
Respiration
Function of the Deep Group of Muscles?
Direct movement of the vertebral column and skull
Innervation for Deep Group?
Dorsal rami of the spinal nerves
Innervation for the superficial and middle groups?
Ventral rami of the spinal nerves
Three parts of Erector Spinae Muscle (Medial to Lateral)
Spinalis Longissimus and Iliocostalis
Action: Erector Spinae Muscle
Extension and lateral flexion of vertebral column
What makes up the intervertebral disc?
Anulus Fibrosus and Nucleus Pulposus
# of Vertebrae: Cervical thoracic lumbar sacral coccyx
7 Cervical 12 thoracic 5 lumbar 5 sacral and 4 coccyx
Know body vertebral foramen vertebral canal pedicle laminae transverse process articular process and spinous process
What connects the inner surface of the laminae of adjacent vertebrae?
Ligamenta Flava
What is located in the epidural space?
Internal Vertebral Venous Plexus and Epidural fat
What is significant about the Internal Vertebral Venous Plexus concerning the spread of cancer?
Contains no valves. Pathway for the spread of cancer from abdomen to the brain
What are the 3 meningeal layers covering the spinal cord?
Dura Mater Arachnoid Membrane and Pia Mater
The Dura Mater extends from where to where?
The base of the skull to S2
What does the Dura Mater form at S2?
Filum Terminale Externum (Coccygeal Ligament)
What cannot be separated from the spinal cord?
Pia Mater
What joins to form a spinal nerve?
Dorsal and Ventral Roots of the Spinal Cord
What occurs on the dorsal root at approximately the vertebral foreman?
Dorsal Root Ganglion
What is a lateral extension of the Pia Mater?
Denticulate Ligaments
Denticulate ligaments extend between what?
Ventral and Dorsal Roots of the spinal cord
What is the function of the Denticulate Ligaments?
It anchors the Dura Mater between the exits of the ventral and dorsal roots from the dural sac to help stabilize the spinal cord
How far inferior does the spinal cord extend?
L2 (or L1)
Where does the spinal cord enlarge? Why?
Cervical and Lumbar Enlargements (many nerves that supply the upper and lower limbs)
What is the structure called where the spinal cord tapers off at L2?
Conus Medullaris
What extends from the inferior tip of the conus medullaris? What is it an extension of?
Filum Terminale Internum (Pia Mater)
What surrounds the filum terminale internum?
Cauda Equina
What is the cauda equina?
Massive collection of ventral and dorsal roots of the spinal nerves and filum terminale within the inferior part of the dural sac
What lines the posterior (anterior) surface of the vertebral bodies? Function?
Posterior (Anterior) Longitudinal Ligament (Prevents hyperflexion (hyperextension) of the vertebral column)
Muscles of the Scapular Region?
Deltoid Supraspinatus Infraspinatus Teres Minor Teres Major and Subscapularis
What nerves enter the skin at the posterior border of the Deltoid?
Branches of the superior lateral brachial Cutaneous nerve
What are the borders of the Quadrangular Space?
Superiorly: Teres Minor. Medially: Long Head of the Triceps. Laterally: Shaft of Humerus. Inferiorly: Teres Major
What is located in the Quadrangular Space?
Axillary Nerve and Posterior Circumflex Humeral Artery
What are the borders of the Triangular Space?
Superiorly: Teres Minor Laterally: Long Head of the Triceps Inferiorly: Teres Major
What is located in the Triangular Space?
Circumflex Scapular Artery
Insertion: Supraspinatus
Sup. Facet of Greater Tubercle of Humerus
What crosses the suprascapular notch?
Superior Transverse Scapular Ligament
What courses superiorly to the above-mentioned ligament?
Suprascapular Artery. (A-Army over the Bridge)
What courses inferiorly to the above-mentioned ligament?
Suprascapular Nerve (Superior Truck of Brachial Plexus) C5 and C6. N-Navy under the bridge
Suprascapular Nerve innervates?
Supraspinatus and Infraspinatus Muscles
What makes up the Rotator Cuff?
Supraspinatus SitS: Infraspinatus Teres Minor Teres Minor and Subscapularis
What is the lymphatic drainage of the mammary glands?
The entire mammary gland is superficial to what?
The deep fascia of the Pectoralis Major Muscle
What veins are located at the lateral and medial aspects of the arm respectively?
Cephalic and Basilic Veins
Where do the Cephalic and Basilic Veins originate?
Lateral and medial sides of the dorsal venous arch respectively on the posterior of the hand
Describe the path and termination of the Cephalic Vein.
Anterior surface of the forearm and arm Ascends between the Deltoid and Pec. Major In the Deltopectoral Triangle. Inferior to clavicle the Cephalic vein penetrates the costocoracoid membrane. Terminates in the Axillary Vein in the axilla
What forms the axillary vein?
2 brachial veins and the Basilic Vein
What connects the Basilic and Cephalic Veins? Significance?
Median Cubittal Vein (Phlebotomy)
What forms the anterior axillary fold?
Pectoralis Major
Where does Pec. Major insert?
Crest of Greater Tubercle
What passes through the costocoracoid membrane of the clavipectoral fascia?
Cephalic Vein Lateral Pectoral Nerve and Thoracoacromial Artery Trunk
These 3 structures pass through the costocoracoid membrane in what relation to Pec. Minor?
Medial to Pectoralis Minor
What is the origin of the Thoracoacromial Artery Trunk?
A branch of the 2nd part of the Axillary Artery
What does the clavicular branch supply?
Subclavius M. and the sternoclavicular Joint
What encloses pectoralis minor?
Clavipectoral fascia
Where is the clavipectoral fascia located?
Between the clavicle to the axillary fascia
What is the costocoracoid membrane?
The clavipectoral fascia between the clavicle and pectoralis minor
What is the Suspensory Ligament of the Axilla?
The clavipectoral fascia located inferior to Pec. Minor and extending to the axillary fascia
Where does Pectoralis Minor insert?
Coracoid Process of the Scapula
What pierces Pectoralis Minor?
Medial Pectoral Nerve
Why is Pectoralis Minor an important landmark?
Its position divides the Axillary Artery into 3 parts
Boundaries of the Axilla
Triangle Shape
Anterior
Pectoralis Major Pectoralis Minor Clavipectoral Fascia
Medial
Serratus Anterior Upper Ribs
Posterior
Subscapularis Latissimus Dorsi Teres Major
Lateral
Intertubercular Groove
Base
Axillary Fascia
Apex
Clavicle Scapula First Rib
Axillary Vein Borders (Becomes)
Lateral border of Teres Major Lateral border of first rib (Subclavian Vein)
What is the main source of blood to the shoulder and upper limb?
Axillary Artery
Borders?
Lateral border of first rib Inferior border of Teres Major
What divides the Axillary Artery into 3 parts?
Pectoralis Minor
Name the location of the divisions?
1st Part: Medial to Pectoralis Minor 2nd Part: Deep to Pectoralis Minor and 3rd Part: Lateral to Pectoralis Minor
What branches from the 1st part of the Axillary Artery? Supplies?
Superior Thoracic Artery 1st and 2nd Intercostal Space
What branches from the 2nd part of the Axillary Artery?
Thoracoacromial Artery Trunk Lateral Thoracic Artery
What is the path of the Lateral Thoracic Artery?
Courses on the surface of Serratus Anterior to supply structures of the chest wall
What courses with the Lateral Thoracic Artery?
Long Thoracic Nerve (Serratus Anterior: Winged Scapula)
What branches from the 3rd part of the Axillary Artery?
Subscapular Artery Posterior Circumflex Humeral Artery and Anterior Circumflex Humeral Artery
What branches from the Subscapular Artery?
Circumflex Scapular Artery and Thoracodorsal Artery
What provides collateral circulation with the Circumflex Scapular Artery?
Suprascapular Artery (Subclavian Artery) and Dorsal Scapular Artery (Subclavian Artery)
What does the Circumflex Scapular Artery pass through? Does it course with any other structure?
Triangular Space. No
What is the main blood supply to Latissimus Dorsi?
Thoracodorsal Artery
What courses with the Thoracodorsal Artery?
Thoracodorsal Nerve (Posterior Cord on BP)
What does the Posterior Circumflex Humeral Artery pass through? Does it course with any other structure?
Quadrangular Space Axillary Nerve (C5 and C6)
What part of the Humerus does the Anterior and Posterior Circumflex Humeral Arteries surround?
Surgical Neck of the Humerus
Which Humeral Circumflex Artery is larger?
Posterior Humeral Circumflex
What does the Axillary artery become at the lateral border of Teres Major?
Brachial Artery
The 5 parts of the Brachial Plexus?
Roots Trunks Divisions Cords Branches
The roots of the Brachial Plexus are made up of ____________.
Ventral Rami of C5 – T1
What part of the Brachial Plexus is superior to the clavicle?
Ventral Rami Roots and the 3 Trunks
What part of the Brachial Plexus is deep to the clavicle?
The 3 anterior and 3 posterior Divisions
What parts of the Brachial Plexus is inferior to the clavicle?
3 Cords and the Terminal Branches
What is the significance of anterior and posterior Divisions of the Brachial Plexus?
They represent the separation of nerve fibers that innervate the ventral and dorsal muscle masses of the limb
What are the Cords of the Brachial Plexus?
Lateral Posterior Anterior
What are the Cord names in reference to?
Their relationship to the 2nd part of the Axillary Artery (Deep to Pec. Minor)
What forms the posterior cord?
The junction of 3 posterior Divisions. Derived from each of the 3 Trunks
The posterior cord contributes to the innervation of what?
The dorsal (extensor) surface of the limb and shoulder
What forms the lateral cord?
Anterior Divisions of the Superior and Middle Trunks
What forms the medial cord?
The anterior Division of the inferior trunk
What do the lateral and medial cords innervate?
Muscles on the ventral (flexor) surface of the limb and anterior chest wall
The cords of the Brachial Plexus should be found deep to what muscle?
Pectoralis Minor (2nd part of the Axillary Artery)
What nerve branches off the lateral cord?
Lateral Pectoral Nerve
What is the path of the Lateral Pectoral Nerve?
Passes Medial to Pectoralis Minor Through Costocoracoid Membrane and Innervates Pectoralis Major
What nerves branch off the medial cord?
Medial Pectoral Nerve Medial Antebrachial Cutaneous Nerve and Medial Brachial Cutaneous Nerve
What is the path of the medial pectoral nerve?
Passes between the Axillary Artery and Axillary Vein Penetrates (Innervates) Pectoralis Minor and Innervates Pectoralis Major
What courses with the Basilic Vein?
Medial Antebrachial Cutaneous Nerve
To what nerves does the medial cord contribute?
Median and Ulnar Nerve
What contributes to the formation of the Median Nerve?
Lateral Cord and Medial Cord (C5 C6 C7 C8 T1)
Initially where is the Median Nerve located?
On the anterolateral side of the Axillary Artery
What contributes to the formation of the Musculocutaneous Nerve?
Lateral Cord
What does the Musculocutaneous Nerve innervate?
Ventral side of the arm and lateral skin of the forearm?
What is the path of the Musculocutaneous Nerve as it enters the arm?
It penetrates the Coracobrachialis Muscle
What nerves branch off from the posterior cord?
Upper Subscapular Nerve Thoracodorsal Nerve and Lower Subscapular Nerve
What innervates Subscapularis Muscle?
Upper and Lower Subcapular Nerves
What innervates Teres Major?
Lower Subscapular Nerve
What courses with the Thoracodorsal Nerve?
Thoracodorsal Artery (3rd part of the Axillary Artery)
What forms the Axillary Nerve?
Posterior cord splits to form the Axillary Nerve(C5 C6) and the Radial Nerve(C5 C6 C7 C8 T1)
What is the path of the Axillary Nerve? (Relate to Subscapularis)
Passes inferior to Subscapularis Through Quadrangular Space
What does the Axillary Nerve innervate?
Teres Minor and Deltoid
What passes through the Quadrangular Space?
Axillary Nerve Posterior Circumflex Humeral Artery
What cutaneous nerves does the Axillary Nerve provide?
Posterior Shoulder
What form the Radial Nerve?
The split of the posterior cord into Radial Nerve and Axillary Nerve
What in general does the Radial Nerve innervate?
The dorsal muscle mass and skin of the arm and forearm
Note the characteristic M configuration on the ventral surface of the Axillary Artery
Where is the Musculocutaneous nerve in relation to the Axillary Artery?
Lateral
What nerves are medial to the Axillary Artery?
Ulnar Nerve Medial Brachial Cutaneous Nerve and Medial Antebrachial Cutaneous Nerve
What is the initial path of the Radial Nerve?
Posterior to the Axillary Artery and Enters the Radial Groove of the Humerus
What does these 5 groups receive?
Afferent lymphatic vessels from the upper limb shoulder and mammary gland
What group is mainly responsible for draining lymph from the mammary gland?
Pectoral Group
Collectively these 5 groups form what?
Subclavian Lymphatic Trunk
Where does the Subclavian Lymphatic Trunk drain?
Right: Junction of the Right Subclavian and Internal Jugular veins. Left: Left Brachiocephalic vein
What boundary is the Serratus Anterior in the axilla?
Medial Wall of the Axilla
What is the origin of the Serratus Anterior Muscle?
Upper eight or nine ribs
Where does the Serratus Anterior insert?
The costal surface of the entire medial border of the Scapula
What innervates Serratus Anterior?
Long Thoracic Nerve and (Long –N- Nerve)
Function of Serratus Anterior?
Holds scapula against thoracic wall Protracts the scapula and Rotates glenoid cavity of scapula superiorly
What occurs if the Serratus Anterior or Long Thoracic Nerve is damaged?
Winged Scapula (Scapula projects dorsally away for chest wall)
What forms the posterior wall of the axilla?
Subscapularis (Largest) Latissimus Dorsi and Teres Major
What innervates Subscapularis?
Upper Subscapular Nerve and Lower Subscapular Nerve
What stabilizes the Humerus in the glenoid cavity?
Rotator Cuff and Tendon of Long Head of Triceps
What compartments of the arm exist?
Anterior Flexor Compartment and Posterior Extensor Compartment
What separates these compartments?
Intermuscular Septa
What supports and maintains the structure of the arm?
Brachial Fascia
What does the Brachial Fascia form on the lateral and medial aspects of the arm?
Lateral and Medial Intermuscular Septa
What muscles are located in the Anterior Flexor Compartment of the arm?
Biceps Brachii Coracobrachialis and Brachialis
Where does the Biceps Brachii originate?
Short Head: Coracoid Process Long Head: Supraglenoid Tubercle
Where does the Biceps Brachii insert?
Tuberosity of the Radius
What is the Bicipital Aponeurosis?
Superficial medially directed aponeurotic extension from the medial side of the Biceps Brachii Tendon
What is the function of the Bicipital Aponeurosis?
Protective covering for the Median Nerve and Brachial Artery in the Cubital Fossa
Where is the Brachialis Muscle located?
Deep to the inferior half of the Biceps Brachii
Where does the Brachialis Muscle originate?
Ventral surface of the inferior Humerus
Where does the Brachialis Muscle insert?
Tuberosity of the Ulna
What is the location of the Coracobrachialis? (In Relation to the Biceps Brachii)
Medial and parallel to the short head of the Biceps Brachii
What is the origin and insertion of the Coracobrachialis?
Origin: Coracoid Process Insertion: Medial aspect of the middle of the Humerus
What innervates the muscles of the anterior compartment?
Musculocutaneous Nerve
What is the course of the Musculocutaneous Nerve through the arm?
Pierces the Coracobrachialis Muscle Into the muscular plane between the Brachialis Muscle and the Biceps Brachii
Where does the Musculocutaneous nerve emerge from the arm?
Laterally from between the Brachialis Muscle and the Biceps Brachii
After emerging in the inferior part of the arm what does the Musculocutaneous Nerve become?
Lateral Antebrachial Cutaneous Nerve
What does the previous nerve supply?
Cutaneous innervation to the skin of the lateral forearm (GSE GVE GVA)
What supplies cutaneous innervation to the medial aspect of the forearm?
Medial Antebrachial Cutaneous Nerve (Medial Cord of Brachial Plexus)
Where is the origin of the Brachial Artery?
Originates from the inferior border of Teres Major as a continuation of the Axillary Artery
Where does the Brachial Artery course?
Anterior Compartment of the arm Within the Neurovascular compartment
What forms the Neurovascular compartment of the arm?
Splitting of the medial intermuscular septum
Initially what is the position of the Median Nerve and Ulnar Nerve in relation to the Brachial Artery?
Median Nerve: Lateral to Brachial Artery Ulnar Nerve: Medial to Brachial Artery
During their course through the arm what is the relationship between the Median Nerve and Brachial Artery?
The Median Nerve passes from the lateral side of the Brachial Artery ventrally across to the medial side of the Brachial Artery
What accompanies the Brachial Artery?
2 Brachial Veins (Not nerves) (Venae Comitantes)
Where do these veins terminate?
Basilic Vein
What are the main branches of the Brachial Artery (superior to inferior)?
Deep Brachial Artery Superior Ulnar Collateral Artery and Inferior Ulnar Collateral Artery
The Deep Brachial Artery arises just inferior to what muscle?
Teres Major Muscle
What is the course of the Deep Brachial Artery?
Medial to the Humerus it enters the posterior compartment of the arm in the Radial Groove of the Humerus
What enters the Radial Groove with the Deep Brachial Artery?
Radial Nerve
What arises from the Brachial Artery just inferior to the Deep Brachial Artery?
Superior Ulnar Collateral Artery
What courses with the Superior Ulnar Collateral Artery?
Ulnar Nerve
What is the path of the Superior Ulnar Collateral Artery and Ulnar Nerve?
Penetrates the intermuscular septum to enter the posterior compartment of the arm. Descending the arm both pass posterior to the medial epicondyle of the Humerus
Where does the Inferior Ulnar Collateral Artery originate?
From the Brachial Artery just superior to the medial epicondyle
What is the path of the Inferior Ulnar Collateral Artery?
It passes anterior to the medial epicondyle of the Humerus
What is significant about the Deep Brachial Artery Superior Ulnar Collateral Artery and the Inferior Ulnar Collateral Artery?
Collateral Circulation for the Brachial Artery around the elbow
Intersecting artery in collateral circulation?
Radial Recurrent Artery Recurrent Interosseous Artery and Posterior Ulnar Recurrent Artery
Do the Median Nerve and Ulnar Nerve provide innervation within the arm?
No
What is the origin of the Triceps Brachii?
Long Head: Infraglenoid Tubercle and Lateral Head: Humerus superior and lateral to Radial Groove and Medial Head: Humerus inferior and medial to Radial Groove
What is located deep to the Lateral Head of the Triceps Brachii?
Radial Groove Radial Nerve and Deep Brachial Artery
What nerve innervates Triceps Brachii?
Radial Nerve
What regions does the Radial nerve provide cutaneous innervation to the skin?
Posterior Brachial Cutaneous Branches and Posterior Antebrachial Cutaneous Branches
In the lower 3rd of the arm what is the path of the Radial Nerve?
Pierces lateral intermuscular septum just superior to lateral epicondyle Passes anterior to lateral epicondyle
When the Radial Nerve moves across the lateral epicondyle what is its relationship to neighboring muscles?
As it passes anterior to the lateral epicondyle the Radial Nerve is between the Brachialis Muscle and the Brachioradialis Muscle
What muscles do the Radial Nerve innervate at the lateral epicondyle?
Brachioradialis Muscle and Extensor Carpi Radialis Longus Muscle
What forms an arterial branch that contributes to collateral circulation between the axillary and brachial arteries?
Deep Brachial Artery and Has ascending branch that anastomoses with the Anterior and Posterior Circumflex Humeral vessels
What courses with the Radial Nerve anterior to the lateral epicondyle?
Radial Recurrent Artery
What is the Cubital Fossa?
The triangular region on the ventral side of the elbow that contains most of the vessels and nerves that pass between the arm and the forearm
Is the Ulnar Nerve in the Cubital Fossa?
No
What significant vein is superficial to the Cubital Fossa?
Median Cubital Vein (Phlebotomy)
Boundaries of the Cubital Fossa
Roof (Anterior): Bicipital Aponeurosis. Floor (Posterior): Brachialis Muscle and Supinator Muscle. Lateral: Brachioradialis Muscle. Medial: Pronator Teres
What nerve is deep to the lateral boundary of the Cubital Fossa?
Radial Nerve
What does the Radial Nerve divide into?
Superficial Radial Nerve and Deep Radial Nerve
What is the path of the Superficial Radial Nerve?
Passes superficial to the Supinator Muscle Deep to the Brachioradialis Muscle
What is the initial path of the Deep Radial Nerve?
Penetrates the Supinator Muscle
Lateral to Medial what structures are found in the Cubital Fossa?
TAN
At the apex of the Cubital Fossa what does the Brachial Artery divide into?
Radial Artery Ulnar Artery
What connects the Ulna and Radius of the forearm?
Interosseous Membrane
What is the Extensor Retinaculum?
A transverse thickening of the deep (Antebrachial) fascia on the dorsum of the wrist
What is found on the dorsum of the hand that forms the Cephalic and Basilic Veins?
Dorsal Venous Plexus. Medial side: Basilic Vein. Lateral side: Cephalic Vein
What supplies cutaneous nerves to the dorsum of the hand?
Medial: Ulnar Nerve. Lateral: Superficial Radial Nerve
What are the superficial muscles of the extensor compartment of the forearm?
Brachioradialis Muscle Extensor Carpi Radialis Longus Muscle Extensor Radialis Brevis Muscle Extensor Digitorum Muscle Extensor Digiti Minimi Muscle and Extensor Carpi Ulnaris Muscle
What muscles are innervated by the Radial Nerve before its division?
Brachioradialis Muscle and Extensor Carpi Radialis Longus Muscle
What innervates the Extensor Carpi Radialis Brevis Muscle? When?
Deep Radial Nerve Proximal to the Supinator Muscle
What muscles are innervated by the Deep Radial Nerve distal to it penetration of the Supinator Muscle?
Extensor Digitorum Muscle Extensor Digiti Minimi Muscle Extensor Carpi Ulnaris Muscle
Which muscle’s tendon does not cross the carpal bones to the dorsum of the hand in the superficial extensor group?
Brachioradialis Muscle
Where does the Brachioradialis Muscle insert?
Styloid Process of the Radius
What muscles make up the deep extensor muscle compartment of the forearm?
Supinator Muscle Abductor Pollicis Longus Muscle Extensor Pollicis Brevis Muscle Extensor Pollicis Longus Muscle Extensor Indicis Muscle
Where does the Supinator Muscle insert in relation to the Pronator Teres Muscle?
Anterior surface of the radius proximal to the insertion of Pronator Teres
What nerve innervates the Supinator Muscle?
Deep Radial Nerve
What nerve innervates the remaining four muscles?
Deep Radial Nerve

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