Muscles of the Posterior Thigh

Question 1

What is another name for the muscles of the posterior thigh?

Answer 1

Hamstring muscles (short head of biceps femoris not classed as hamstring)

Question 2

What are the 3 muscles of the posterior thigh?

Answer 2

Semi-tendinous Semi-membranous Biceps femoris (short and long head)

Question 3

Action of muscles of posterior compartment of thigh?

Answer 3

All flex knee and extend hip except biceps femoris short head which only flexes the knee

Question 4

Nerve supply to the muscles of the posterior thigh?

Answer 4

All supplied by tibial branch of sciatic nerve (L5, S1, S2) except biceps femoris short head which is supplied by common fibular branch of sciatic nerve (L4 - S3)

Question 5

What are the spinal nerve roots of the tibial branch of the sciatic nerve?

Answer 5

L5, S1, S2

Question 6

What are the spinal nerve roots of the common fibular branch of sciatic nerve?

Answer 6

L4-S3

Question 7

Name this muscle

Answer 7

Semi-tendinous

Question 8

Name this muscle

Answer 8

Semi-membranous

Question 9

Name this muscle

Answer 9

Biceps femoris short head

Question 10

Name this muscle

Answer 10

Biceps Femoris Long Head

Question 11

How to differentiate between the semitendonous and semimembranous?

Answer 11

Semitendinous has a long tendon whereas the semimembranous has a shiny membranous appearance