Chapter 7B (Posterior Thigh Region)

Question 1

Hamstrings that act to extend the hip and flex the knee:

Answer 1

• Semitendinousus
• Semimembranosus
• Biceps femoris

Question 2

Innervation for the hamstrings that act to extend the hip and flex the knee

Answer 2

Divisions of the sciatic nerve

Question 3

The hamstring muscles share the following common features:

Answer 3

• Proximal attachment to the ischial tuberosity deep to the gluteus maximus
• Distal attachment to the bones of the leg
• They span and act on two joints (hip and knee joints)
• Innervated by the tibial division of the sciatic nerve

Question 4

(Injuries to Sciatic Nerve)

May present with pain in the buttocks due to compression of the sciatic nerve by the ____ ____

Answer 4

piriformis muscle (piriformis syndrome)

Question 5

(Injuries to Sciatic Nerve)

_____ of cases of piriformis syndrome is caused by ____ due to trauma of the buttocks and spasm of the piriformis.

Answer 5

50%; hypertrophy

Question 6

(Injuries to Sciatic Nerve)
In ____ ____ of the sciatic nerve, the leg is useless as. extension of the hip and flexion of the leg is lost, as well as all ankle and foot movements

Answer 6

complete lesions

Question 7

(Injuries to Sciatic Nerve)
\_\_\_\_ \_\_\_\_ (e.g. from a stab wound) may involve the inferior gluteal and/or posterior femoral cutaneous nerves, with recovery being slow and usually incomplete.

Answer 7

Incomplete lesion

Question 8

(Injuries to Sciatic Nerve)
Wounds to the ____ ____ ____ ____ ____ are more prone to injuring the sciatic nerve than the ____ _____, affecting the hamstring muscles which complete thigh extension and leg flexion.

Answer 8

medial side of the buttocks; lateral side