nerves in forearm

8/7/2019 Nerves in Forearm

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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



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 .



Palmar cutaneous

branch of median nerve



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



Palmer cut.br.of ulnar

Palmer cut.br.of median



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



Radial nerve in the

forearmAnterior to the lateralEpicondyle, it divides intotwo terminal branches:

a)superficial radial

b) Post. Interosseous

Posterior interosseous

Superficial radial



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



POSTERIORINTEROSSEOUS

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

Radial nerve



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.

nerves in forearm

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