Muscles Of The Shoulder

Question 1

What is the origin of the biceps brachii?

Answer 1

Short head= apex of the coracoid process of the scapula
Long head=supraglenoid tubercle of the scapula

Question 2

What is the insertion of the biceps brachii?

Answer 2

Radial tuberosity, antebrachial fascia

Question 3

What is the Action of the biceps brachii?

Answer 3

Flexion and supination of the forearm
Flexion of the shoulder

Question 4

What is the origin of the pectoralis major?

Answer 4

Medial 1/2 of the clavicle
manubrium
Sternal body
True ribs and their costal cartilages

Question 5

What is the insertion of the pectoralis major?

Answer 5

Greater tubercle of the humerus

Question 6

What is the action of the pectoralis major?

Answer 6

Arm adduction, medial rotation and flexion (clavicular head)
Arm extension (sternocostal head)

Question 7

What is the origin of the anterior deltoid?

Answer 7

Lateral 1/3 of the clavicle
Acromion of the scapula
Spine the scapula

Question 8

What is the insertion of the anterior deltoid?

Answer 8

Deltoid tuberosity of the humerus

Question 9

What is the action of the anterior deltoid?

Answer 9

Medial rotation and flexion of the shoulder

Question 10

What nerve innervates the anterior deltoid?

Answer 10

Axillary nerve

Question 11

What nerve innervates the biceps brachii?

Answer 11

Musculocutaneous nerve

Question 12

What is the origin of the coracobrachialis?

Answer 12

Coracoid process of the scapula

Question 13

What is the insertion of the coracobrachialis?

Answer 13

Middle 1/3 of Medial aspect of the humerus

Question 14

What is the action of the coracobrachialis?

Answer 14

Arm adduction and flexion

Question 15

What is the innervation of the coracobrachialis?

Answer 15

Musculocutaneous nerve

Question 16

What is the origin of the latissimus dorsi?

Answer 16

Spinous processes of T7-L5
Ribs 9-12
Iliac crest

Question 17

What is the insertion of the latissimus dorsi?

Answer 17

Intertubercular sulcus of the humerus

Question 18

What is the action of the latissimus dorsi?

Answer 18

Shoulder extension, adduction and medial rotation

Question 19

What is the origin of the teres major?

Answer 19

Inferior angle of the scapula

Question 20

What is the insertion of the teres major?

Answer 20

Lesser tubercle of the humerus

Question 21

What is the action of the teres major?

Answer 21

Extension and medial rotation of the shoulder

Question 22

What is the origin of the posterior deltoid?

Answer 22

Lateral 1/3 of the clavicle
Acromion of scapula
Spine of scapula

Question 23

What is the insertion of the posterior deltoid?

Answer 23

Deltoid tuberosity of the humerus

Question 24

What is the action of the posterior deltoid?

Answer 24

Lateral rotation and extension of the shoulder

Question 25

What is the origin of the triceps?

Answer 25

Posterior aspect of the humerus Infraglenoid tubercle of the scapula

Question 26

What is the insertion of the triceps?

Answer 26

Olecranon process of the ulna

Question 27

What is the action of the triceps?

Answer 27

Extension of the shoulder Extension of the forearm

Question 28

What is the origin of the supraspinatus?

Answer 28

Supraspinous fossa of the scapula

Question 29

What is the insertion of the supraspinatus?

Answer 29

Greater tubercle of the humerus

Question 30

What is the action of the supraspinatus?

Answer 30

Abduction of the shoulder

Question 31

What is the origin of the teres minor?

Answer 31

Lateral border of the scapula

Question 32

What is the insertion of the teres minor?

Answer 32

Greater tubercle of the humerus

Question 33

What is the action of the teres minor?

Answer 33

Lateral rotation of the shoulder

Question 34

What is the origin of the infraspinatus?

Answer 34

Infraspinous fossa of the scapula

Question 35

What is the insertion of the infraspinatus?

Answer 35

Greater tubercle of the humerus

Question 36

What is the origin of the subscapularis?

Answer 36

Subscapular fossa of the scapula

Question 37

What is the insertion of the subscapularis?

Answer 37

Lesser tubercle of the humerus

Question 38

What is the action of the subscapularis?

Answer 38

Medial rotation of the shoulder

Question 39

What is the origin of the rhomboid major?

Answer 39

Spinous process of T2-T5

Question 40

What is the insertion of the rhomboid major?

Answer 40

Medial border of the scapula, inferior to the scapula spine

Question 41

What is the action of the rhomboid major?

Answer 41

Retracts and downwardly rotates the shoulder girdle

Question 42

What is the origin of the rhomboid minor?

Answer 42

Spinous processes of C7-T1

Question 43

What is the insertion of the rhomboid minor?

Answer 43

Medial border of the scapula, adjacent to the scapula spine

Question 44

What is the action of the rhomboid minor?

Answer 44

Retracts and downwardly rotates the shoulder girdle

Question 45

What is the origin of the serratus anterior?

Answer 45

Ribs 1-9 (external surfaces)

Question 46

What is the insertion of the serratus anterior?

Answer 46

Medial border of the scapula

Question 47

What is the action of the serratus anterior?

Answer 47

Protracts and upwardly rotates the shoulder girdle

Question 48

What is the origin of the pectoralis minor?

Answer 48

Ribs 3-5 (anterior ends)

Question 49

What is the insertion of the pectoralis minor?

Answer 49

Coracoid process of the scapula

Question 50

What is the action of the pectoralis minor?

Answer 50

Protracts and downwardly rotates the shoulder girdle