Unit 1: Lecture 12

Question 1

The arm is sometimes referred to as the…

Answer 1

brachium

Question 2

The bulk of the arm is formed by four muscles (innervations in parenthesis):

Answer 2

• biceps brachii (musculocutaneous)
• brachialis, 2 heads (musculocutaneous)
• coracobrachialis (musculocutaneous)
• triceps brachii, 3 heads (radial nerve)

Question 3

Muscles of arm are organized by a deep fascia which is continuous with axillary fascia, called…

Answer 3

brachial fascia

Question 4

Medial brachial cutaneous nerve (from medial cord) innervates…

Answer 4

skin of arm

Question 5

Medial antebrachial cutaneous nerve (from medial cord) innervates…

Answer 5

skin of forearm

Question 6

Posterior surface of the arm is supplied by the…

Answer 6

posterior brachial cutaneous nerve, which is a branch of the radial nerve

Question 7

Lateral and anterolateral surfaces of the arm supplied by…

Answer 7

superior and inferior lateral brachial cutaneous nerves (branches of axillary and radial nerves, respectively)

Question 8

Skin of shoulder is also supplied by the…

Answer 8

superior lateral brachial cutaneous nerve

Question 9

Biceps tendon of the long head of the biceps brachii runs in the _________ and is held in place by the ________ bridging the intertubercular groove

Answer 9

intertubercular groove; transverse humeral ligament

Question 10

Directly beneath the belly of the biceps brachii is the distal extension of the __________, the __________

Answer 10

axillary artery; brachial artery

Question 11

The brachial artery begins at….

Answer 11

the lower border of the teres major

Question 12

The brachial artery courses along the _______ aspect of the arm in a thickening of the brachial fascia called the _________

Answer 12

medial; medial intermuscular septum

Question 13

Branches of brachial artery (2)

Answer 13

• muscular branches (supply anterior compartment of arm; biceps brachia, the brachialis, and coracobrachialis)
• Profunda brachii (supplies triceps, and runs w/ radial nerve around the back of the shaft of the humerus)

Question 14

Median nerve

Answer 14

• runs w/ brachial artery, and lateral to the artery before elbow. After elbow, they cross and median nerve is more medial

Question 15

Brachial veins

Answer 15

• two in number, located medially & laterally

- run with basilic vein to form the axillary vein at lower border of teres major

Question 16

Lateral and medial intermuscular septum

Answer 16

• prominent aggregations of the deep fascia
• each is attached to humerus, then each courses to the superficial aspect of the arm
• median nerve and brachial vessels course down the medial aspect of arm WITHIN the medial inter muscular septum
• the lateral intermuscular septum contains radial nerve.