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
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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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