Glossary of Muscles that move the Humerus

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The pectoralis major and latissimus dorsi are known as___muscles because they originate on the axial skeleton.
a. Triangular
b. Suprascapular
c. Thoracodorsal
d. axial
D. Axial
What muscle is located on the inferior part of the back and commonly known as the "swimmer's muscle"?
a. Subscapularis
b. Latissimus Dorsi
c. Rotator Cuff
d. Teres Major
B. latissimus dorsi
What is the most commonly injured muscle of the rotator cuff due to its location between the head of the humerus and the acromion process of the scapula?
a. Supraspinatus
b. Infraspinatus
c. Teres Minor
d. Subscapularis
A. Supraspinatus
What injury can occur due to repetitive movement of an arm over the head?
Impingement syndrome
This muscle originates on the clavicle and the sternum and inserts on the intertubercular sulcus of the humerus-
Pectoralis major
The Pectoralis Major performs which of these actions?
a. adducts
b. medially rotates
c. flexes and extends arm
d. all of the above
D. all of the above
The latissimus dorsi performs which of these actions?
a. extends and medially rotates arm
b. adducts arm
c. flexes arm
d. a and b
D. a and b
What muscle originates at the lumbar vertabrae crests of the sacrum and the ilium and lumbar facia?
Latissimus dorsi
Where does the latissimus dorsi insert?
Intertubercular sulcus
Name the axial muscle(s) that medially rotates the arm-
a. Pectoralis major and Latissimus dorsi
b. deltoid
c. Teres major and Teres minor
d. all of the above
A. Pectoralis Major and latissimus dorsi
(The rest are scapular muscles)
What is the nerve innervation for the deltoid muscle?
Axillary nerve
What muscle originates on the acromial end of the clavicle and inserts on the deltoid tuberosity?
What are the actions of the deltoid muscle?
a. Extend and laterally rotate the arm
b. abduct
c. flex and medially rotate
d. all of the above
D. All of the above
The subscapularis originates at the___, and inserts at the ___?
Subcapular fossa of scapula, lesser tubercle of humerus
What is the action of the subscapularis?
Medially rotates arm
Wher does the supraspinatus originate and insert?
Supraspinous fossa of scapula, greater tubercle of humerus
What is the action of the suprapinatus muscle?
a. Adduct arm
b. Assist Subscapularis in rotating the arm
c. flexes arm
d. Assists deltoid in abducting the arm
D. assists deltoid in abducting the arm
Where does the Infraspinatus originate and insert?
Infraspinous fossa, greater tubercle
What is the action of the Infraspinatus?
Laterally rotates and adducts arm
Name the SITS muscles that insert on the Greater tubercle of the humerus-
Suprapinatus, Infraspinatus, and Teres Minor
Name all of the muscles that laterally rotate the humerus-
Deltoid, Infraspinatus, and Teres minor
Where does the teres major originate and insert?
Inferior angle of the scapula, and medial lip of intertubercular sulcus
What is the action of the teres major?
Extends arm at the shoulder joint and assists in adduction and medial rotation of arm
What muscle originates at the inferior lateral border of the scapula and inserts on the greater tubercle of the humerus?
Teres minor
What is the action of the teres minor?
Laterally rotates, extends, and adducts arm
Name the muscle that originates on the coricoid process-
Where does the coracobrachialis originate and insert?
Coracoid process of the scapula, and middle of medial shaft surface of humerus
What is the action of the coracobrachialis?
Flexes and adducts arm at shoulder joint
What muscle makes up the anterior border of the axilla?
Pectoralis major
What muscle makes up the posterior axillary border?
Latissimus dorsi
Name the muscles that make up the rotator cuff
Supraspinatus-infraspinatis-teres minor-subscapularis
Which muscles can medially rotate the arm?
(there are 5)
Pectoralis major-deltoid (anterior)-latissimus dorsi-subscapularis-Teres major
Which muscles flex the arm?
(there are 3)
P. major-deltoid (Anterior)-coracobrachialis
Name the 2 muscles that abduct the arm
lateral deltoid and supraspinatus
What 3 muscles laterally rotate the arm?
posterior deltoid, teres minor, and infraspinatus
What 5 muscles extend the arm?
Latissimus dorsi, posterior deltoid, teres minor, teres major, pectoralis major
There are 6 muscles that adduct the humerus, name them.
Pectoralis major, latissimus dorsi, infraspinatus, teres major, teres minor, coracobrachialis

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