2.7 Arm, Forearm, and Hand

Question 1

What is the action of the biceps brachii m?

Answer 1

supinates and flexes forearm, flexes arm

Question 2

What is the proximal attachment of the short head of the biceps brachii m?

Answer 2

coracoid process of scapula

Question 3

What is the proximal attachment of the long head of the biceps brachii m?

Answer 3

supraglenoid tubercle of scapula

Question 4

What is the distal attachment of the biceps brachii m?

Answer 4

radial tuberosity

Question 5

What is the action of the brachialis m?

Answer 5

flexes forearm

Question 6

What is the proximal attachment of the brachialis m?

Answer 6

humerus

Question 7

What is the distal attachment of the brachialis m?

Answer 7

ulnar tuberosity

Question 8

What is the action of the coracobrachialis m?

Answer 8

flexes arm

Question 9

What is the proximal attachment of the coracobrachialis m?

Answer 9

coracoid process of scapula

Question 10

What is the distal attachment of the coracobrachialis m?

Answer 10

humerus

Question 11

What is the innervation of the triceps brachii m?

Answer 11

radial n

Question 12

What is the action of the triceps brachii m?

Answer 12

extends forearm and arm

Question 13

What is the proximal attachment of the long head of the triceps brachii m?

Answer 13

infraglenoid tuberose of scapula

Question 14

What is the proximal attachment of the lateral head of the triceps brachii m?

Answer 14

humerus superior to the radial groove

Question 15

What is the proximal attachment of the medial head of the triceps brachii m?

Answer 15

inferior to the radial groove of the humerus

Question 16

What is the distal attachment of the triceps brachii m?

Answer 16

olecranon of ulna

Question 17

The medial brachial and antebrahcial cutaneous nn. provide sensory innervation of the skin of the medial side of the arm and forearm, and arise from where?

Answer 17

medial cord (C8-T1)

Question 18

The lateral brachial cutaneous n. innervates skin of the lateral side of the arm, and arises from where?

Answer 18

axillary n. (C5-C6)

Question 19

What is the common proximal attachment of the muscles of the anterior forearm?

Answer 19

medial humeral epicondyle (common flexor origin)

Question 20

What is the common innervation of the muscles of the anterior forearm?

Answer 20

Median n. with minor contributions from the ulnar n.

Question 21

What is the common action of the muscles of the anterior forearm?

Answer 21

flexion of elbow, wrist, and hand, also pronate forearm

Question 22

What is the common proximal attachment of the muscles of the posterior forearm?

Answer 22

lateral humeral epicondyle (common extensor tendon)

Question 23

What is the common innervation of the muscles of the posterior forearm?

Answer 23

radial n.

Question 24

What is the common action of the muscles of the posterior forearm?

Answer 24

extension of joints of the elbow, wrist, and hand, also supinate forearm

Question 25

What muscle of the posterior compartment of the forearm is the exception, as it passes ant. to the elbow and thus acts as a flexor?

Answer 25

brachioradialis

Question 26

The lateral antebrachial cutaneous n. innervates skin of the lateral side of the forearm, and arises from where?

Answer 26

musculocutaneous n. (C5-C7)

Question 27

What passes over the anatomical snuff box and provides cutaneous innervation to the lateral aspect of the hand and dorsum of proximal parts of lateral 3.5 digits?

Answer 27

superficial branch of the radial n.

Question 28

What innervates the thenar muscles?

Answer 28

recurrent motor branch of median n.

Question 29

What innervates the hypothenar muscles?

Answer 29

deep branch of the ulnar n.

Question 30

The midpalmar space is continuous with the anterior forearm via the …

Answer 30

carpal tunnel

Question 31

The carpal tunnel contains…

Answer 31

tendons of flexors and median n.

Question 32

What passes superficial to the carpal tunnel allowing sensation to the palm to remain intact if swelling occurs?

Answer 32

palmar cutaneous branch of median n.

Question 33

The radial a. anastomoses with … to form the deep palmar arch (on metacarpals)

Answer 33

deep branch of ulnar artery

Question 34

The ulnar a. continues as … in the hand.

Answer 34

superficial palmar arch

Question 35

The ulnar a. enters the hand via Guyon’s canal, lying … to the ulnar n.

Answer 35

lateral

Question 36

What provides sensory innervation to the skin on the lateral palm and palmar surface of the lateral 3.5 digits, along with the dorsal distal half

Answer 36

superficial branch of the median n.