5.2 Anatomy of Muscular System Part 3

Question 1

What is the origin and insertion of the latissimus dorsi?

Answer 1

origin = spinous process of inferior thoracic and lumber vertebra and ribs 8-12
insertion = intertubercular groove of humerus

Question 2

What is the action of the latissimus dorsi?

Answer 2

extension, adduction, and medial rotation at shoulder

Question 3

What is the innervation of the latissimus dorsi?

Answer 3

thoracodorsal nerve

Question 4

What is the origin and insertion of the coracobrachialis?

Answer 4

origin = coracoid process of scapula
insertion = medial shaft of humerus

Question 5

What is the action of the coracobrachialis?

Answer 5

adduction and flexion at shoulder

Question 6

What is the innervation of the coracobrachialis?

Answer 6

musculocutaneous nerve

Question 7

What are the muscles of the forearm and elbow?

Answer 7

biceps brachii
brachialis
brachioradialis
triceps
pronator teres
supinator

Question 8

What is the origin and insertion of the biceps brachii?

Answer 8

origin = short head-coracoid process long head - supraglenoid tubercle of scapula
insertion = tuberosity of radius

Question 9

What is the action of the biceps brachii?

Answer 9

flexion at elbow and shoulder
supination

Question 10

What is the innervation of the biceps brachii?

Answer 10

musculocutaneous nerve

Question 11

What is the origin and insertion of the brachialis?

Answer 11

origin = anterior/distal surface of humerus
insertion = tuberosity of ulna

Question 12

What is the action of the brachialis?

Answer 12

flexion at elbow

Question 13

What is the innervation of the brachialis?

Answer 13

musculocutaneous nerve and radial nerve

Question 14

What is the origin and insertion of the brachioradialis?

Answer 14

origin = lateral epicondyle of humerus
insertion = lateral aspect of styloid process of radius

Question 15

What is the action of the brachioradialis?

Answer 15

flexion at elbow

Question 16

What is the innervation of the brachioradialis?

Answer 16

radial nerve

Question 17

What is the origin and insertion of the triceps?

Answer 17

origin = lateral head is superior and lateral margins on humerus
long head is infraglenoid tubercle of scapula
medial head is psoterior surface of humerus
insertion = olecranon of ulna

Question 18

What is the action of the triceps?

Answer 18

extension at ulna

Question 19

What is the innervation of the triceps?

Answer 19

radial nerve

Question 20

What is the origin and insertion of the pronator teres?

Answer 20

origin = medial epicondyle of humerus
insertion = mid-lateral surface of radius