Nerves

Brachial PlexusRoots

C5

C6

C7

C8

T1

Brachial PlexusTrunks

UpperTrunk

MiddleTrunk

LowerTrunk

C5

C6

C7

C8

T1

Brachial PlexusDivisions

Eash trunk gives anterior and

posterior divisions(behind middle ⅓ of the clavicle )

C5

C6

C7

C8

T1

Brachial PlexusCords

C5

C6

C7

C8

T1

PosteriorCord

Brachial PlexusCords

C5

C6

C7

C8

T1

PosteriorCord

MedialCord

Brachial PlexusCords

C5

C6

C7

C8

T1

PosteriorCord

MedialCord

LateralCord

Brachial PlexusLateral Cord Branches

Lateralpectoral

Musculocutaneous

Lateral rootof Median n.

Brachial PlexusMedial Cord Branches

Medial Rootof Median

Medial Pectoral

Medial Cutaneousn. of Forearm

Ulnar

Brachial PlexusPosterior Cord Branches

UpperSubscapular

LowerSubscapular

Axillary

N. To LatissimusDorsi

Radial

Brachial PlexusUpper Trunk Branches

Suprascapular

Nerve to Subclavius

Brachial PlexusRoots Branches C5

C6

C7

C8

T1

N. toSerratusAnterior

Root ofPhrenic

N. ToRhomboids

Brachial PlexusInjuries1.Complete Injury

Brachial PlexusInjuries2.Erb’s Injury

Brachial PlexusInjuries3.Klumpke’s Injury

MusculocutaneousNerve

Mixed nerve from the lateral cord

Course:Lareral: the 3rd part of Axillary artery

Leaves the axilla by piercing the coracobrachialis m.

Then descends downwards between biceps and brachialis.

Finally continues as lateral cutaneous nerve of the forearm

Branches:Coracobrachialis, Biceps & Brachialis

Radial NerveC5,6,7,8,T1

Course & Relations:

Arm

Lies behind the upper part of the brachial artery between it & the 2 heads of triceps

long headof Triceps

Brachial artery

Radial NerveC5,6,7,8,T1

Course & Relations:

ArmAfter leaving the spiral

groove:The nerve pierces the lateral intermuscular septum to enter the

anterior compartment on the lateral side of the

arm

Radial NerveC5,6,7,8,T1

Course & Relations:

ForearmIn front of the lateral

epicondyleit gives the

posterior interosseous

& continues downwards as the superficial radial

nerve.

Supinator

Radial NerveC5,6,7,8,T1

Course & Relations:

ForearmNerve winds around the lateral side of the radius to reach the

back of the hand cross over the anatomical snuff box

Median NerveFormed by:

branches from medial & lateral cords(C6, 7, 8 & T1)

Crosses the brachial artery

Brachialartery

Median Nerve

Lies medial to biceps,

Course

Biceps

Mediannerve

Ulnarnerve

Median Nerve

Lies medial to biceps,

anterior to brachialis & triceps

Course

Brachialis

Mediannerve

Ulnarnerve

Triceps

Triceps

In the arm: gives no branches

Median NerveCourse

Passes bet 2 heads of pronator teres

deep to flexor digitorum superficialis

deep to flexor retinaculum

BetweenFlexor Pollicis Longus &

Flexor Digitorum Superficialis

Lies onFlexor Digitorum Profundu

Median NerveBranches

Supplies flexors of the forearm

Except

FlexorCarpi-Ulnaris

Medial ½Flexor Digitorum

Profundus

FlexorPollicisBrevis

AbductorPollicisBrevisMedian Nerve

Branches

OpponensPollicis

All Thenar Ms.Except

Adductor Pollicis

1st & 2nd

Lumbricals

Median NerveBranches

PalmarCutaneous

Nerve of Palm

Median NerveBranches

Palmar surface of lateral 3 ½ digits

Median NerveInjury

ApeHand

Deformity

Ulnar NerveTerminal branch of

the medial cord of the brachial plexus

Ulnar NervePasses through

posterior compartment of the arm

(behind the medial epicondyle )

UlnarnerveMedian

nerve

NOBRANCHES IN

ARM

Ulnar NerveEnters between

the heads of flexor carpi ulnaris

FlexorDigitorumProfundus

FlexorCarpi ulnaris

Ulnar NerveIn the Forearm

Supplies:

Medial ½Flexor

DigitorumProfundus

FlexorCarpi ulnaris

Ulnar NerveEnds by dividing into:

1. Superficial Branch

Superficial Branchabove Retinaculum

1 ½ fingers

Ulnar NerveEnds by dividing into:

1.Superficial Branch2.Deep Branch

AllHypothenar

muscles

AllInterossei

AdductorPollicis

3rd & 4th

Lumbricals

Sciatic NerveRoots

L4

L5

S1

S2

S3

It arises from:

L4 – S3

Sciaticnerve

Sciatic NerveExtent

Sciaticnerve

Piriformsmuscle

Inferior border of Piriformsto

Lower 1/3 of the thigh

Sciatic NerveCourse & Branches

Leaves pelvisthrough

Greater Sciatic foramenSciaticnerve

Sciatic Nerve

Biceps femoris

Semitendinosis

Adductor Magnus

Semimembranosus

Sciatic Nerve

Sciaticnerve

Tibialnerve

CommonPeroneal

nerve

Divides into:•Tibial nerve•Common Peroneal nerve

Sciatic Nerve

Tibial

SuppliesMuscles of the foot

Tibial

Supplies SuperficialPosterior Compartment of leg

Sciatic NerveCommon Peroneal

Supplies AnteriorCompartment of leg

LateralSuralnerve

Common Peroneal