Arm and shoulder muscles

Question 1

Serratus anterior origin

Answer 1

External surfaces of the upper 8 or 9 ribs.

Question 2

Serratus anterior insertion

Answer 2

Anterior surface of the medial border of the scapula.

Question 3

Serratus anterior actions with origin fixed

Answer 3

Abduct, upwardly rotate and depress the scapula at the scapulothoracic joint, Hold the medial border of the scapula against the rib cage.

Question 4

Serratus anterior innervation

Answer 4

Long thoracic nerve

Question 5

Serratus anterior actions with the scapula fixed

Answer 5

May act to elevate the thorax during forced inhalation.

Question 6

Serratus anterior palpation key

Answer 6

Supine, flex the shoulder to 90 degrees. Place the hand on the posterior ribs and have client alternate between abducting and relaxing the scapula.

Question 7

Pectoralis minor origin

Answer 7

Third, fourth and fifth ribs

Question 8

Pectoralis minor insertion

Answer 8

Medial surface of the coracoid process of the scapula

Question 9

Pectoralis minor actions

Answer 9

Depress, abduct and downwardly rotate the scapula at the S/T joint. Assist to elevate the thorax during forced inhalation when the scapula is fixed.

Question 10

Pectoralis minor innervation

Answer 10

Medial pectoral nerve and fibers from the communicating branch of the lateral pectoral nerve.

Question 11

Pectoralis minor palpation key

Answer 11

Side-lying, arm flexed and pulled anteriorly. Run thumb under pectoralis major. Ask partner to depress scapula.

Question 12

Coracobrachialis origin

Answer 12

Coracoid process of the scapula

Question 13

Coracobrachialis insertion

Answer 13

Medial surface of the mid-humeral shaft.

Question 14

Coracobrachialis Actions

Answer 14

Flex and adduct the shoulder at the glenohumeral joint.

Question 15

Coracobrachialis innervation

Answer 15

Musculocutaneous

Question 16

Coracobrachialis palpation key

Answer 16

Supine, laterally rotate and abduct the shoulder to 45 degrees. Place hand along medial side of arm and perform horizontal adduction with resistance.

Question 17

Muscles which flex the shoulder at the glenohumeral joint

Answer 17

Deltoid (anterior), pectoralis major (upper), biceps brachii, coracobrachialis.

Question 18

Muscles which extend the shoulder at the glenohumeral joint

Answer 18

Deltoid (posterior), latissimus dorsi, teres major, pectoralis major (lower), triceps brachii (long head)

Question 19

Muscles which horizontally abduct the shoulder

Answer 19

Deltoid (posterior)

Question 20

Muscles which horizontally adduct the shoulder

Answer 20

Deltoid (anterior), pectoralis major (upper)

Question 21

Muscles which abduct the shoulder at the glenohumeral joint

Answer 21

Deltoid, supraspinatus

Question 22

Muscles which adduct the shoulder at the glenohumeral joint

Answer 22

Latissimus dorsi, teres major, infraspinatus, teres minor, pectoralis major, triceps brachii (long head), coracobrachialis

Question 23

Muscles which laterally rotate the shoulder at the glenohumeral joint

Answer 23

Deltoid (posterior), infraspinatus, teres minor

Question 24

Muscles which medially rotate the shoulder at the glenohumeral joint

Answer 24

Deltoid (anterior), latissimus dorsi, teres major, subscapularis, pectoralis major

Question 25

Muscles which elevate the scapula

Answer 25

Trapezius (upper), rhomboids, levator scapula

Question 26

Muscles which depress the scapula

Answer 26

Trapezius (lower), serratus anterior (with origin fixed), pectoralis minor

Question 27

Muscles which adduct the scapula

Answer 27

Trapezius (middle), rhomboids

Question 28

Muscles which abduct the scapula

Answer 28

Serratus anterior (with origin fixed), pectoralis minor

Question 29

Muscles which upwardly rotate the scapula

Answer 29

Trapezius (upper and lower), serratus anterior (with origin fixed)

Question 30

Muscles which downwardly rotate the scapula

Answer 30

Rhomboids, levator scapula, pectoralis minor