Chapter 6 Elbow and Radioulner Joint

Question 1

Biceps Brachii long head O&I

Answer 1

origin: supraglenoid tubercle above the superior lip of the glenoid fossa
insertion: tuberosity of the radius and bicipital aponeurosis (lacerates fibrosis)

Question 2

Biceps Brachii long head action

Answer 2

supination, flexion, weak flexion of should, weak abduction or shoulder

Question 3

Biceps Brachii long head innervation

Answer 3

musculocutaneous nerve (C5, C6)

Question 4

Biceps Brachii short head O&I

Answer 4

origin: coracoid process of the scapula and upper lip of the glenoid fossa in conjunction with the proximal attachment of the coracobrachialis
insertion: tuberosity of the radius and bicipital aponeurosis (lacerates fibrosis)

Question 5

Bicaps Brachii short head action

Answer 5

supination, flexion, weak flexion of shoulder, weak abduction of the shoulder

Question 6

Bicapes Brachii short head innervation

Answer 6

musculocutaneous nerve (C5, C6)

Question 7

Brachialis O&I

Answer 7

origin: distal half of the anterior shaft of the humerus
insertion: coronoid process of ulna

Question 8

Brachialis action

Answer 8

flexion of the elbow

Question 9

Brachialis innervation

Answer 9

musculocutaneous nerve (C5, C6)

Question 10

Brachioradialis O&I

Answer 10

origin: distal 2/3 of the lateral condyloid (supracondylar) ridge of the humerus
insertion: lateral surface of the distal end of the radius at the styloid process

Question 11

Brachioradialis action

Answer 11

flexion, pronation from supination to neutral, supination from pronation to nuetral

Question 12

Brachioradialis innervation

Answer 12

radial nerve (C5, C6)

Question 13

Pronator Teres O&I

Answer 13

origin: distal part of the medial condyloid ridge of humerus and the medial side of proximal ulna
insertion: middle 1/3 of the lateral surface of the radius

Question 14

Pronator Teres action

Answer 14

pronation of the forearm, weak flexion of the elbow

Question 15

Pronator Teres innervation

Answer 15

median nerve (C6, C7)

Question 16

Pronator Quadratus O&I

Answer 16

origin: distal 1/4 of the anterior side of the ulna
insertion: distal 1/4 of the anterior side of the radius

Question 17

Pronator Quadratus action

Answer 17

pronation of the forearm

Question 18

Pronator Quadratus innervation

Answer 18

median nerve (C6, C7)

Question 19

Triceps Brachii long head O&I

Answer 19

origin: infraglenoid tubercle below inferior lip of gleaned fossa of the scapula
insertion: olecranon process of the ulna

Question 20

Triceps Brachii long head action

Answer 20

extension, extension of shoulder, adduction of shoulder, horizontal abduction of shoulder

Question 21

Triceps Brachii long head innervation

Answer 21

radial nerve (C7, C8)

Question 22

Triceps Brachii lateral head O&I

Answer 22

origin: upper half of the posterior surface of the humerus
insertion: olecranon process of the ulna

Question 23

Triceps Brachii lateral head action

Answer 23

extension

Question 24

Triceps Brachii lateral head innervation

Answer 24

radial nerve (C7, C8)

Question 25

Triceps Brachii medial head O&I

Answer 25

origin: distal 2/3 of the posterior surface of the humerus
insertion: olecranon process of the ulna

Question 26

Triceps Brachii medial head action

Answer 26

extension

Question 27

Triceps Brachii medial head innervation

Answer 27

radial nerve (C7, C8)

Question 28

Supinator O&I

Answer 28

origin: lateral epicondyle of the humerus and neighboring posterior part of the ulna
insertion: lateral surface of the proximal radius just below the head

Question 29

Supinator action

Answer 29

supination of the forearm

Question 30

Supinator innervation

Answer 30

radial nerve (C6)

Question 31

Anconeus O&I

Answer 31

origin: posterior surface of the lateral condyle of the humerus
insertion: posteroir surface of the lateral olecranon process and proximal 1/4 of the ulna

Question 32

Anconeus action

Answer 32

extension

Question 33

Anconeus innervation

Answer 33

radial nerve (C7, C8)