Median Nerve

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Median nerve.png
Median Nerve
Nerve Type Mixed nerve
Origin
  • Lateral root: lateral cord of the brachial plexus (C5, C6, C7)
  • Medial root: medial cord of the brachial plexus (C8, T1)
Major Branches anterior interosseous nerve, palmar cutaneous branch, motor branch in the hand
Sensory innervation Medial palm plus entire palmar and distal dorsal surface of the lateral 3.5 digits.
Motor innervation flexor compartment of the forearm, thenar and intrinsic hand muscles


Motor Supply

All but five intrinsic hand muscles are innervated by the ulnar nerve. The remaining are innervated by the C8-T1 roots via the Median Nerve. The mnemonic AbOF can be used to remember which muscles are above the law in that they aren't innervated by the ulnar nerve: the abductor (Ab) and flexor (F) pollicis brevis, opponens pollicis (O), and lateral lumbricals (Law).[1]

References

  1. Stoker, Geoffrey E.; Kim, Han Jo; Riew, K. Daniel (2014-02). "Differentiating c8-t1 radiculopathy from ulnar neuropathy: a survey of 24 spine surgeons". Global Spine Journal. 4 (1): 1–6. doi:10.1055/s-0033-1354254. ISSN 2192-5682. PMC 3908974. PMID 24494175. Check date values in: |date= (help)