Glossary of 2-Arm
Other Decks By This User
- Name the 2 compartments of the arm and which muscles are in each. What is the action of each
- anterior-biceps brachii, brachialis, coracobrachialis=flexors
- What do the two proximal heads of the biceps brachii attach to?
- both attach to scapula
short head-coracoid porcess
- What fixes the long head of the biceps brachii in place?
- transverse humeral ligament
- Describe the path of the long head of the biceps brachii as it attches to the supraglenoid tubercle.
- runs into glenoid joint, over head of humerus, inside the intertubercular groove where it will be fixed in place
- What does the distal end of the biceps brachii attach to? What separates them to reduce abration?
- tuberosity of radius
- After attaching to the tuberosity of the radius the biceps continues as what? What does this merge with?
- bicipital aponeurosis
antebrachial (deep) fascia
- Where is the antebrachial fascia located?
- on top of flexor muscles in medial side of forearm
- What is the function of the bicipital aponeurosis?
- protect brachial artery and median nerve in cubital fossa, lessons pressure on biceps tendon on radial tuberosity during pronation and supination of forearm
- What is the action of the biceps brachii?
- flexes forearm when elbow is extended
supine the forearm when elbow is flexed (ie drive a screw)
- What innervates the biceps brachii?
- musculocutaneous nerve
- What is being tested in the bicipital myotatic reflex?
- deep-tendon reflex, musculocutaneous N or C5,6
- What are some injuries that can happen to the long head of the biceps brachii?
- biceps tendonitis, dislocation of the tendon, rupture of the tendon
- What is the appearance of a rupture of the tendon of the long head of the biceps?
- "Popeye deformity"-detached muscle forms ball near center of distal part of anterior aspect of arm
- What is the function of the brachialis?
- elbow flexor
- What innervates the brachialis?
- musculocutaneous N
- What is the origination and insertion of the brachialis?
i-corocoid process of ulna
- Which nerve pierces through the coracobrachialis? (the same nerve that innervates it)
- What is the function of the coracobrachialis?
- flexes and adducts arm
- The coracobrachialis cooperates w/ the deltoid and long head of triceps to do what?
- stabilize glenohumeral joint by resisting downward dislocation of the head of the humerus
- Which 2 nerves run deep to the coracobrachialis?
- median and humeral
- What is the origin and insertion of the triceps brachii?
- o-olecranon of ulna
- What is the function of the triceps brachii?
- extend forearm, stabilize glenohumeral joint when arm is adducted, prevents inferior displacement of head of humerus, extension and adduction of arm
- What helps to reduce the friction between the tendon and olecranon?
- the distal attachment passes over the subtendinous olecranon bursa
- How can the triceps be tested for injury?
- abduct the arm 90 degrees first, then extend elbow joint against resistance
- What innervates the triceps brachii?
- radial N
- What is the small relatively unimportant muscle in the posterior compartment of the arm?
- Where does the bradhial artery begin and end? What does it branch into?
- from inferior border of teres major and ends in cubital fossa under the bicipital aponeurosis, divides into radial and ulnar arteries
- What nerve does the brachial artery run with?
- Where is the brachial artery located w/ respect to the humerus, triceps and brachialis?
- at first medial to humerus, anterior to triceps and brachialis, eventually becomes anterior to humerus
- What are the branches of the brachial artery on the medial side? (lateral branches aren't named)
- deep artery of arm
superior ulnar collateral
inferior ulnar collateral
- Which medial branch of the brachial artery is the most superior and the largest branch?
- deep artery of the arm
- Which 2 medial branches of the brachial artery arise in the middle of the arm?
- nutrient humeral and superior ulnar collateral
- Which medial branch of the brachial artery arises close to the elbow?
- inferior ulnar collateral
- Which medial branch of the brachial artery runs w/ the radial nerve?
- deep artery of the arm
- Which medial branch of the brachial artery runs w/ the ulnar nerve?
- superior ulnar collateral
- Where is the best place to compress the brachial artery to stop bleeding?
- compress against the humerus near the middle of the arm
- What may be damaged when the humeral bone is fractured?
- brachial artery and radial nerve
- Name the superficial veins of the arm. How do these 2 veins communicate
- cephalic and basilica
communicate through median cubital vein
- On what side is the cephalic and basilica vein located? Where does each drain?
both drain to axillary vein
- What are the four major nerves that pass through the arm? Which 2 have branches?
- musculocutaneous and radial branch
median and ulnar don't branch
- Which cord of the brachial plexus does the musculocutaneous nerve branch from?
- What does the musculocutaneous nerve innervate?
- all anterior flexors (3 muscles)
- Describe the path of the musculocutaneous nerve.
- begins at inferior border of pectoralis minor, pierces coracobrachialis, runs in between biceps and brachialis, ends at lateral cutaneous nerve of forearm
- The radial nerve is a direct continuation of which brachial plexus cord?
- Which muscle does the radial nerve innervate?
- Where does the radial nerve branch?
- lateral epicondyle of the humerus
- Which artery does the radial nerve run with?
- deep artery of the arm
- Where is the radial nerve located w/ respect to the triceps, brachial artery and humerus?
- anterior to triceps, posterior to brachial artery, medial to humerus
- What does the deep branch of the radial nerve continue on to become?
- posterior interosseous nerve
- Which part of the skin does the superficial radial nerve supply?
- posterior forearm and dorsum of hand
- What does the median nerve form from?
- union of lateral and medial cord of the brachial plexus
- What does the median nerve innervate?
- elbow joint
- Describe the path of the median nerve? What does it run with?
- runs lateral to brachial artery until middle of arm, crosses to medial side and descends to cubital fossa, runs under bicipital aponeurosis
- What nerve comes from the medial cord of the brachial plexus?
- What does the ulnar nerve innervate?
- muscles of hands and a few forearm muscles
- What does the ulnar nerve pierce?
- medial intermuscular septum
- What artery does the ulnar nerve run with?
- superior ulnar collateral
- At the distal arm what is the path of the ulnar nerve?
- passes posterior to medial epicondlye and medial to olecranon to enter forearm
- Where is the ulnar nerve located w/ respect to the triceps and brachial artery?
- anterior to triceps
medial to brachial artery
- What makes the 'crazy bone'?
- ulnar nerve running posterior to epicondyle
- What can occur with injury tot he musculocutaneous nerve?
- paralysis of coracobrachialis, biceps and brachialis, weakened forearm flexion and supination, loss of sensation on lateral surface of forearm
- What is the sign of a radial nerve injury?
- wrist-drop, can't extend at metacarpophalangeal joints
- What can be the result of injury to the radial nerve before the branches to the triceps? What is the difference if the nerve isn't injured until after the triceps?
- paralysis of triceps, brachioradialis, supinator and extensors of wrist and digits, loss of sensation in dorsum hand and digits, injury after -triceps may not be completely paralyzed
- What are the boundaries of the cubital fossa?
- superior-imaginary line connectingmedial and lateral epicondyles
floor-brachialis and supinator muscles of forearm
roof-deep fascia and bicipital aponeurosis
- What is contained in the cubital fossa?
- terminal part of brachial arteries and its branches, radial and ulnar arteries, deep veins, biceps brachii tendon, median nerve, radial nerve branches and median cubital nerve
- What is the clinical significance of the cubital fossa?
- Which fingers are affected with injury at the proximal interphalangeal (PIP) joint? DIP? metacarpophalangeal?
- -flexion of digits 1-3 are lost, 4-5 are weakened
-flexion of 2-3 lost, 4-5 not affected
-flexion of 2-3 affected
You must Login or Register to add cards