topic 13

Question 1

Branches of sacral plexus

Answer 1

1.Superior gluteal: L4-S1 + Nerve to quadratus femoris
2.Inf. gluteal & 3.nerve to obturator internus: L5 - s2
4.Post. femoral cutaneous : S1 -S3
5.Pudendal : S2 - S4
6.sciatic : L4 - S3

L4 L5 S1 - S4 remember to draw the diagram

Question 2

coursing of nerves?

Answer 2

1.exits through greater sciatic foramen, sup. border of piriformis
2.exits through g.s.f, inf. border of piriformis
3.exits through g.s.n, inf. to piriformis and btwn post. femoral cutaneous & pudendal
4.enter post. thigh by g.s.n , inf to piriformis and sup to obturator internus
5.exits through g.s.f, down gluteal region, dorsal to sacrospinous lig. , medial to internal pudendal vessels, out through l.s.f in pudendal canal then splits into 3
6. exits the pelvis and enters the gluteal region via g.s.f. emerges inferiorly to the piriformis muscle descends inferolateral direction & bifrucates a popliteal fossa

Question 3

muscles and/or areas supplied by nerves

Answer 3

1.Tensor fascia latae, gluteus medius & minimus
2.gluteus maximus
3.obturator internus , gemellus & hip joint
4.skin of post thigh & perineum
5.post. of thigh

Question 4

branches of nerves

Answer 4

1 & 2 : n/a
3. gluteal branch-buttocks & long fibular branch- scrotum & labium
4. splits into i.common fibular: descends along medial biceps tendon to neck of fibula with a.deep has 3 b: muscular branch-leg extensors, lat. terminal branch-extensor hallucis & extensor digitorum brevis, med. terminal branch-dorsal digitorum
b. sup. : muscular branch-peroneus longus & brevis and cutaneous branch- skin of anterolateral leg
ii.tibial:passes b/w gastrocnemius heads with popliteal vessels, passs down post tibialis b/w sup & deep flexors : 4 branches : sural nerve , medial & lateral plantar nerves and med. calcaneal branch