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e an nerve nforearm- It enter the forearmby passing between

the 2 heads of PT, theulnar head separatesthe nerve from ulnar artery-It descends betweenFDS & FDP5 cm above the wristit emerges fromunder the lat. Border 

of FDS to appearsbet. FCR & PL.It leaves the forearmby passing deep toflexor retinaculum

(carpal tunnel).

Flexor 

retinaculum

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Branches in forearm1-Muscular : 4 muscles2-Articular: to elbow & superior radioulnar joint

3- Ant. Interosseous nerve: arise after its passage bet. 2 heads of pronator teres. It descends with the artery onthe membrane between FDP & FPLbehind PQBranches:Muscular : 2 ½ muscles

Articular : inferior radioulnar 4-Palmar cutaneous branch: justproximal to retinaculum. Pierces thedeep fascia and run superficial toretinaculum. Ends by dividing into:Lat. Branch: supplies the skin over 

thenar muscle. Medial branches:supply skin of hollow of palm

Palmer 

cut. Br .

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Palmar cutaneous

branch of median nerve

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Ulnar nerve inforearmEnter the forearm by

passing between 2 headsof FCU-runs in forearm betweenFCU and FDP� In the lower part of 

forearm, it lies medial

to ulnar artery andlateral To tendon of FCU

� At wrist: it passes infront of flexor retinaculum,protected by itssuperficial layer 

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Palmer cut.br.of ulnar 

Palmer cut.br.of median

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4- dorsal cutaneous branch:arises 5 cm above wrist, winds around medial sideof wrist to supply:a) Skin of medial 1/3 of dorsum of handb) Skin of dorsal aspect of med. 1 ½ fingers by 2

dorsal digital branches

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Radial nerve in the

forearmAnterior to the lateralEpicondyle, it divides intotwo terminal branches:

a)superficial radial

b) Post. Interosseous

Posterior interosseous

Superficial radial

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a) superficialradial:descends in

forearm lateralto radial arteryand deep tobrachioradialis.7 cm above the

wrist, it emergesfrom beneath themuscle andpeirces the deepfascia giving 5dorsal digitalbranches run onthe roof of anatomical snuff 

box

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POSTERIORINTEROSSEOUS

It peirces the supinator toreach the back of forearmby turning round lat.Aspect of radius.

Radial nerve

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Course of Post Interosseous:-It descends between thesuperficial and deep extensor of 

forearm with the artery� At the distal border of ext. P.B.,it passes deep to the ext. P.L.on the membrane accompaniedby termination of ant.

Interosseous artery.� It passes deep to ext

retinaculum where it ends aspseudoganglion.

� Branches:

� 1) muscular 2) articular: to inferior radio-ulnar,wrist, carpal joints

Supinator 

Post.Inteross.N

Abd.P.L.

Ext. P.B.

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