Upper limb B

Question 1

name an important branch of ulnar artery

Answer 1

common interosseous, which splits into anterior and posterior branches(post. branch pierces through interosseous membrane)

Question 2

Cubital fossa borders

Answer 2

Cubital fossa
Superior border – line between the medial and lateral epicondyles of the humerus
Medial border – lateral border of pronator teres
Lateral border – medial border of brachioradialis

Question 3

contents of cub fossa

Answer 3

Brachial artery and brachial veins (venae comitantes around brachial arteries)
Median nerve
radial nerve
clinical significance: you put stethoscope here during BP measurement to listen to brachial artery

NB the superficial venous system is considered SUPERFICIAL to cubital fossa so not within it (this incl. basilic, cephalic and median cubital v)

Question 4

What is the role of the musculocutaneous nerve in the forearm and arm?

Answer 4

It has a lateral cutaneous branch, which provides SENSORY innervation to the lateral part of the forearm

in the arm, it supplies all the muscles in the anterior compartment

Question 5

where is median nerve damaged easily

Answer 5

Elbow and wrist

Question 6

Why is the ulnar nerve easily damaged? (think of its course)

Answer 6

It goes through the posterior compartment of ARM (doesnt really innervate the arm muscles) and then goes behind the medial epicondyle of the humerus where it can easily be damaged
It can also be damaged at the wrist

Question 7

radial nerve common sites of damage

Answer 7

It lies close to the humerus in the radial groove (spiral groove) so fractures of the humerus could damage the radial nerve
It can also be damaged in the axillary region

Question 8

What two branches does the radial nerve divide into?

Answer 8

Posterior interosseous nerve (motor to extensor compartment of forearm)
Superficial radial nerve (sensory to dorsum/back of hand)