Podcast
Questions and Answers
Which muscles does the femoral nerve supply for motor function?
Which muscles does the femoral nerve supply for motor function?
- Knee flexor muscles
- Adductor muscles
- Abductor muscles
- Hip flexor and knee extensor muscles (correct)
What happens if the femoral nerve is injured?
What happens if the femoral nerve is injured?
- Increased sensitivity in the foot
- Loss of sensation over lateral thigh
- Paralysis of quadriceps femoris muscle (correct)
- Paralysis of abductor muscles
At what point does the femoral nerve split into its terminal branches?
At what point does the femoral nerve split into its terminal branches?
- At the pubic tubercle
- 1 inch below the inguinal ligament
- 2 inches below the inguinal ligament (correct)
- Mid-thigh level
Where does the femoral nerve enter the thigh?
Where does the femoral nerve enter the thigh?
Which nerve provides skin sensation over the anterior and medial sides of the thigh down to the big toe?
Which nerve provides skin sensation over the anterior and medial sides of the thigh down to the big toe?
The femoral nerve enters the thigh from behind the inguinal ligament at a point midway between the anterior superior iliac spine and the pubic symphysis.
The femoral nerve enters the thigh from behind the inguinal ligament at a point midway between the anterior superior iliac spine and the pubic symphysis.
The femoral nerve splits into its terminal branches approximately $5$ cm below the inguinal ligament.
The femoral nerve splits into its terminal branches approximately $5$ cm below the inguinal ligament.
The femoral nerve is formed by the posterior divisions of spinal nerves L1, L2, and L3.
The femoral nerve is formed by the posterior divisions of spinal nerves L1, L2, and L3.
A complete division of the femoral nerve is a common occurrence in stab or gunshot wounds.
A complete division of the femoral nerve is a common occurrence in stab or gunshot wounds.
The femoral nerve supplies motor innervation to the $\text{quadriceps femoris}$ muscle, which is responsible for knee flexion.
The femoral nerve supplies motor innervation to the $\text{quadriceps femoris}$ muscle, which is responsible for knee flexion.
Study Notes
Formation and Course
- The femoral nerve is formed by the posterior division of L2, 3, and 4.
- It enters the thigh from behind the inguinal ligament, midway between the anterior superior iliac spine and the pubic tubercle.
- The nerve lies about a finger breadth lateral to the femoral pulse.
Branches and Innervation
- About 2 inches (5 cm) below the inguinal ligament, the femoral nerve splits into its terminal branches.
- Motor supply: hip flexors (iliopsoas, pectineus, sartorius) and knee extensor (quadriceps femoris muscle).
- Sensory supply: skin sensation is lost over the anterior and medial sides of the thigh, medial side of the lower part of the leg, and along the medial border of the foot as far as the ball of the big toe (via the saphenous nerve).
Clinical Correlation
- The femoral nerve can be injured in stab or gunshot wounds, but a complete division of the nerve is rare.
- Injury results in paralysis of the quadriceps femoris muscle.
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Description
This quiz covers the formation and course of the femoral nerve, as well as its potential causes of injury. It also includes information on the motor supply provided by the femoral nerve.
