Median Nerve

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

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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

↑ 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)

[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)

[1]

Muscles supplied by the Median nerve	Origin	Insertion	Action
Abductor Pollicis Brevis	Flexor retinaculum, scaphoid, and trapezium tubercles	Base of the first proximal phalanx, radial aspect	Thumb Abduction perpendicular to the plane of the palm.
Flexor Carpi Radialis	Medial epicondyle of the humerus	Base of the second metacarpal bone	Wrist flexion, also radially deviates the wrist/hand
Flexor Digitorum Sublimis	Humero-ulnar head: Medial epicondyle of the humerus and medial aspect of the coronoid process. Radial head: Oblique line of the radius	Four tendons insert into each side of the middle phalanx of digits 2-5	PIP Flexion
Flexor Pollicis Brevis	Distal ridge of the trapezium, the trapezoid, capitate, and flexor retinaculum	Base of the proximal phalanx of the thumb on the radial side	MCP flexion
Lumbricals (Hand)	1st and 2nd: Radial surface flexor profundus tendons of index and middle fingers respectively 3rd: Adjacent sides of flexor profundus tendons of middle and ring fingers 4th: Adjacent sides flexor profundus tendons of ring and little fingers	Into radial border extensor expansion dorsum of respective digits	Extension ICPJs plus simultaneous flexion of MCPJs of 2nd-5th digits. Also extension of IPJs when MCPJs are extended.
Opponens Pollicis	Tuberosity of the trapezium and flexor retinaculum	Entire lateral aspect of the shaft of the first metacarpal bone	Thumb Opposition
Pronator Teres	Humeral head: Proximal to the medial epicondyle of the humerus Ulnar head: Medial aspect of the coronoid process of the ulna	Mid-shaft and lateral surface of the radius