Posterior Femoral Muscles

Question 1

Biceps femoris

Answer 1

(L5-S3 to long head; L5-S2 to short head)

attachments- from the ischial tuberosity & sacrotuberous lig. (long head); lateral lip of linea aspera & lateral supracondylar line (short head) to the lateral side of fibular head

actions- flexes & laterally rotates the knee (both heads) & extends hip (long head only)

innervation- tibial division of sciatic (long head) & fibular division of the sciatic nerve (short head)

Question 2

Semimembranosus

Answer 2

(L4-S2)

attachments- from ischial tuberosity to posterior aspect of the medial tibial condyle

actions- extends hip, and flexes & medially rotates knee

innervation- tibial division of the sciatic nerve

Question 3

Semitendinosus

Answer 3

(L4-S2)

attachments- from the ischial tuberosity to the proximal, medial tibia

actions- extends hip, and flexes & medially rotates knee

innervation- tibial division of the sciatic nerve