Lower Limb IV

Question 1

A 22 year man is shot in the groin. On examination he has weak hip flexion, weak knee extension, and impaired quadriceps tendon reflex, as well as sensory deficit in the anteromedial aspect of the thigh.

Answer 1

Femoral nerve

This is a classical description of a femoral nerve injury.

Question 2

A 23 year old man is stabbed in the groin, several structures are injured and the adductor longus muscle has been lacerated. Which of the following nerves is responsible for the innervation of adductor longus?

	A.	Femoral nerve
	B.	Obturator nerve
	C.	Sciatic nerve
	D.	Common peroneal nerve
	E.	Ilioinguinal nerve

Answer 2

Obturator nerve

The adductors are innervated by the obturator nerve

Question 3

Which of the following muscles does not recieve any innervation from the sciatic nerve?

	A.	Semimembranosus
	B.	Quadriceps femoris
	C.	Biceps femoris
	D.	Semitendinosus
	E.	Adductor magnus

Answer 3

Quadriceps femoris

The sciatic nerve is traditionally viewed as being a nerve of the posterior compartment. It is known to contribute to the innervation of adductor magnus (although the main innervation to this muscle is from the obturator nerve). The quadriceps femoris is nearly always innervated by the femoral nerve.