Sciatic Nerve

University:
North Idaho College
Course:
NURS 201 | Fundamentals Of Nursing
Academic year:

2021
Views:

483

Pages:

2
Author:

MichGar

SCIATIC NERVEORIGINIt is the largest nerve in the body and its commencementit measures 2 cm. in breadth. It is a terminal branchof the Sacral plexus.COMPOSTION OF ROOT VALUEIt consists of fibres of the following:DIPANKAR RAY(a)Common Peroneal Neme Dorsal branches of antirior rami ofL4, L5 S1 and S2 nerves.bTibial NerveVentral brandres of anterior rami of L4, L5.Sr S2and S3 herres.COURSE: GLUTEAL REGIONHuman AnaromyFor Examii It enters the gluteal region through the greater Sciatic foramenbelow the pyriformis along with posterior cutaneous nerve ofthe thigh.(ii) The Stiatic nerve traverses the gluteal region in the intervalbetween the ischial tuberosity and the greater trochanterof femur.COURSE: IN THE BACK OF THIGH" It further descends on the back of the thigh lying on theadductor magnus upto the lower 23rd and upper 1/3rdof the back of the thigh.(ii) Where it divides into common peroneal nerve and tibialhere.(iii) The division may take place at any point between the sacralplexus and the lower 1/3 rd part of thighIVThey may come separately - from the Sacral plexus.VIn such case, common peroneal nerve enters the gluteal regionby piercing the pyriformis and tibial nerve below thepyriformis. SCIATIC NERVE2RELATION1IN GLUTEAL REGION(a) POSTERIOR RELATION (FROM ABOVE DOWNWARDS)(i) Posterior surface of ischium - -N.to quadratus femoris intervening.(ii) Gemellus Superior (iii) Tendon of Obturator internus.(iv) Gerellusinferior (v) Quadratus femaris - It separates the Sciatic NHuman For Exam Anatomyfrom the:Tendon of Obturator Extenus.(ii) Capsule of hip joint.b ANTERIOR RELATIONDIPANNAR RAY (c)MEDIAL RELATIONThe name is placed under(i) Posterior cuteneous N. of thigh.Cover of gluteus maximus.(ii) Inferior gluteal artery.2IN BACK OF THIGHaPOSTERIOR RELATION Adductor magnusANTERIOR RELATION(c) MEDIAL RELATIONLong head of bireps femoris,(i) Semimembranouscorces the nerre(ii) Semitendinous.SCIATIC NERVE : BRANCHES(a)ARTICULAR BRANCH TO Hip JOINT(b) MUSCULARThis branch sometimes derived directly from the Sacral plexus.(iii) (iv) SemitinLong Semimembranous. head of biceps femoris (ii) Ischial fibres of adductor magnusdinous () Bireps (Short head)ARTERIAL SUPPLYArteria comitans nervi ischiadiei 1 branch of inferior(ii) Brandres from the perforating artery.gluteal arttry.