The ulnar nerve originates from the brachial plexus and passes behind the medial epicondyle of the humerus at the elbow before entering the palm of the hand. It is commonly injured at the elbow, where it lies behind the medial epicondyle, often due to fractures of the medial epicondyle, and at the wrist, where it is superficial and vulnerable to cuts and stab wounds in front of the flexor retinaculum. The document provides details on the anatomical course and sites of potential injury of the ulnar nerve.

2. Short tracking of ulnar nerve
 The origin of the ulnar nerve from the medial cord of
the brachial plexus in the axilla (C8 and T1).
 gives off no cutaneous or motor branches in the
axilla or in the arm.
 The ulnar nerve passes from behind the medial
epicondyle of the humerus, crosses the medial
ligament of the elbow joint.
 The ulnar nerve enters the palm of the hand by
passing in front of the flexor retinaculum and
lateral to the pisiform bone; here it has the ulnar
artery lateral to it.

4. Site of injury of ulnar nerve
Ulnar nerve is commonly injured in tow
places:
1. at the elbow, where it lies behind the
medial epicondyle.
2. at the wrist, where it lies with the ulnar
artery in front of the flexor retinaculum.

5. Site of injury of ulnar nerve
 The injuries at the elbow are usually
associated with fractures of the medial
epicondyle of humerus .
 The superficial position of the nerve at the
wrist makes it vulnerable to damage from
cuts and stab wounds.

7. The end of seminar