Posterior Compartment Of Thigh

Question 1

What are the muscles in posterior compartment of thigh? (3)

Answer 1

Biceps femoris, semitendinosus, semimembranosus

Question 2

What are they all innervated by and what’s the exception?

Answer 2

All innervated by the tibial part of the sciatic nerve, except the short head of biceps femoris which is innervated by the common fibulae part of the sciatic nerve.

Question 3

Origin of biceps femoris

Answer 3

Long head= ischial tuberosity
Short head= linea aspera

Question 4

Insertion of biceps femoris

Answer 4

Tendon into head of fibula

Question 5

Action of biceps femoris

Answer 5

Flexion at knee, extends thigh at hip, laterally rotates at hip + knee

Question 6

Origin of semitendinosus

Answer 6

Ischial tuberosity

Question 7

Insertion of semitendinosus

Answer 7

Medial surface of tibia

Question 8

Action of semitendinosus

Answer 8

Flexion of leg at knee, extension of thigh at hip, medially rotates the thigh

Question 9

Origin of semimembranosus

Answer 9

Ischial tuberosity

Question 10

Insertion of semimembranosus

Answer 10

Medial tibial condyle

Question 11

Action of semimembranosus

Answer 11

Flexion of leg at knee, extension of thigh at hip, medically rotates the thigh