ulnar nerve

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ul·nar nerve

[TA]
arises from the medial cord of the brachial plexus conveying fibers mainly from the C8 and T1 nerves; it passes down the arm, behind the medial epicondyle of the humerus, and down the ulnar side of the anterior compartment of the forearm to the hand; it gives off muscular branches in the forearm to the flexor carpi ulnaris muscle and the ulnar portion of flexor digitorum profundus and supplies the hypothenar, interosseous, medial lumbricals, adductor pollicis, and deep head of flexor hallucis brevis, and the intrinsic muscles of the hand and the skin of the small finger and medial side of the ring finger and adjacent portions of the palm of the hand. The ulnar nerve is most vulnerable to injury where it passes subcutaneously behind the medial epicondyle of the humerus. Mild injury here produces the so-called crazy bone sensation. An ulnar nerve lesion here causes loss of flexion of metacarpophalangeal joints and of extension at the interphalangeal joints ("claw hand").
Synonym(s): nervus ulnaris [TA], cubital nerve

ulnar nerve

one of the terminal branches of the brachial plexus that arises on each side from the medial cord of the plexus. It receives fibers from both cervical and thoracic nerve roots and supplies the muscles and skin on the ulnar side of the forearm and the hand. It can be easily palpated as the "funny bone" of the elbow as it courses along the groove between the olecranon process and the medial epicondyle of the humerus. Compare median nerve, musculocutaneous nerve, radial nerve.

ul·nar nerve

(ŭl'năr nĕrv) [TA]
Arises from medial cord of brachial plexus conveying fibers mainly from C8-T1 nerves; passes down arm, behind medial epicondyle of humerus, and down ulnar side of anterior compartment of forearm to hand; gives off muscular branches in forearm to flexor carpi ulnaris muscle and ulnar portion of flexor digitorum profundus and supplies hypothenar, interosseous, medial lumbricals, adductor pollicis, and deep head of flexor pollicis brevis, and intrinsic muscles of hand and skin of small finger and medial side of ring finger and adjacent portions of the palm of the hand.
Synonym(s): nervus ulnaris [TA] , cubital nerve.

ulnar nerve

One of the main nerves of the arm that supplies some of the muscles of the forearm and all the small muscles of the hand. It also provides sensation to the skin of the third of the hand on the little finger side. It is near the surface at the back of the elbow where it is liable to be painfully struck. This is the basis for the notion of the ‘funny bone’.
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