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ulnar nerve

Origin: medial cord of the brachial plexus (C8-T1) Efferents: 1) all of the muscles of the hand not innervated by the median nerve a) all interosseous muscles b) thumb adductor c) flexion of 4th & 5th finger at metacarpophalangeal joint 2) muscles of the forearm: ulnar flexion a) flexor carpi ulnaris b) ulnar part of the flexor digitorum profundus Afferents: - sensory: - 4th & 5th fingers & corresponding areas of hand Pathology: injury, ulnar neuropathy: 1) elbow (posterior to the medial epicondyle of humerus) 2) brachial plexus (less common) 3) results in "claw hand" a) loss of flexion at the metacarpophalangeal joints b) loss of extension at the interphalangeal joints 4) mild trauma produces "crazy bone" or "funny bone" sensation Course: - passes inferiorly, posterior to the medial epicondyle of the humerus, down the ulnar side of the anterior compartment of the forearm to the hand

General

peripheral nerve

References

  1. B. Ourmazdi, M.D. Synopsis of Neurology & Examination, B & B Books, Saratoga, CA, 1998
  2. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999
  3. Neal S, Fields KB. Peripheral nerve entrapment and injury in the upper extremity Am Fam Physician. 2010 Jan 15;81(2):147-55. PMID: 20082510 Free article. Review.
  4. NEJM Knowledge+

Components

dorsal digital nerves of ulnar nerve

Images

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