Gross Anantomy- Innervation of Posterior Thigh

Question 1

Describe the Sciatic n.

Answer 1

o From VPR L4-S3
o Descends in posterior thigh deep to biceps femoris m.
o Composed of two divisions:

Question 2

What are the two divisions of the Sciatic n and what muscles do they suppply?

Answer 2

 Tibial division of sciatic n. –
• Supplies “true hamstrings”
o Semimembranosus, semitendinosus, long head biceps femoris mm.
 Common fibular division of sciatic n. –
• Supplies short head biceps femoris mm.

Question 3

Describe the Posterior Femoral Cutaneous n.

Answer 3

o From VPR S1-3
o Supplies skin over posterior thigh and popliteal fossa