Muscles of the Shoulder

Question 1

Deltoid is innervated by

Answer 1

axillary nerve

Question 2

Actions of the deltoid

Answer 2

• flexion and medial rotation of glenohumeral joint
• abduction of glenohumeral joint
• extension and lateral rotation of glenohumeral joint

Question 3

Which muscle is the prime abductor of the arm?

Answer 3

deltoid

Question 4

supraspinatus is innervated by

Answer 4

suprascapular nerve

Question 5

Actions of the supraspinatus

Answer 5

initiate abduction of glenohumeral joint

Question 6

Rotator cuff muscles

Answer 6

-supraspinatus
-infraspinatus
-teres minor
subscapularis

Question 7

Infraspinatus is innervated by

Answer 7

suprascapular nerve

Question 8

Actions of the infraspinatus

Answer 8

lateral rotation of glenohumeral joint

Question 9

Teres minor is innervated by

Answer 9

axillary nerve

Question 10

Actions of the teres minor

Answer 10

lateral rotation of glenohumeral joint

Question 11

Subscapularis is innervated by

Answer 11

upper and lower subscapular nerve

Question 12

actions of the subscapularis

Answer 12

medial rotation of glenohumeral joint

Question 13

Teres major is innervated by

Answer 13

lower subscapular nerve

Question 14

actions of the teres major

Answer 14

adduction of glenohumeral joint and medial rotation of glenohumeral joint

Question 15

Latissimus dorsi is innervated by

Answer 15

thoracodorsal nerve

Question 16

actions of the latissimus dorsi

Answer 16

• medial rotation of glenohumeral joint
• adduction of glenohumeral joint
• extension of glenohumeral joint

Question 17

The ______ joint is the most mobile joint in the body, and with this high level of mobility, there is decreased stability.

Answer 17

glenohumeral

Question 18

____ ______ tendons are the main source of stability for the glenohumeral joint.

Answer 18

rotator cuff (dynamic stabilizer)

Question 19

Serratus anterior is innervated by

Answer 19

long thoracic nerve

Question 20

Actions of serratus anterior

Answer 20

abducts and rotates the scapula upward

Question 21

A winged scapula commonly occurs after an injury to the long thoracic nerve, which runs on the superficial surface of _____ _____.

Answer 21

serratus anterior