Upper Limb Anatomy

Question 1

What is the course of musculocutaneous nerve?

Answer 1

It arises from lateral cord of brachial plexus, penetrates the coracobrachialis muscle then passes obliquely between the biceps brachii and the brachialis to the lateral side of the arm. Above the elbow it pierces the deep fascia lateral to the tendon of the biceps brachii and continues into the forearm as the lateral cutaneous nerve of the forearm

Question 2

Which structure is situated lateral to the pisiform bone?

Answer 2

Ulnar artery

Question 3

Which nerve is at the greatest risk in posterior approach to middle third of the bone?

Answer 3

Radial nerve.

Question 4

What is the course of the radial nerve?

Answer 4

Path
In the axilla: lies posterior to the axillary artery on subscapularis, latissimus dorsi and teres major.
Enters the arm between the brachial artery and the long head of triceps (medial to humerus).
Spirals around the posterior surface of the humerus in the groove for the radial nerve.
At the distal third of the lateral border of the humerus it then pierces the intermuscular septum and descends in front of the lateral epicondyle.
At the lateral epicondyle it lies deeply between brachialis and brachioradialis where it then divides into a superficial and deep terminal branch.
Deep branch crosses the supinator to become the posterior interosseous nerve.

Question 5

What is the largest branch of the brachial artery?

Answer 5

Profunda brachii artery

Question 6

What structure separates the cephalic vein and the brachial artery in antecubital fossa?

Answer 6

Bicipital aponeurosis,

Question 7

Which muscle inserts onto the lesser tuberosity of the humerus?

Answer 7

Subscapularis muscle