Femoral Nerve: Anatomy, Function and Conditions
The femoral nerve is the largest nerve of the lumbar plexus, providing motor and sensory supply to the front of the thigh and the medial lower leg.
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The femoral nerve is the largest nerve of the lumbar plexus, providing motor and sensory supply to the front of the thigh and the medial lower leg.
What Is the Femoral Nerve?
The femoral nerve (Latin: Nervus femoralis) is the largest branch of the lumbar plexus, a network of nerves originating from the lumbar spine. It arises from spinal nerve roots L1 to L4 and travels through the lower abdomen and into the thigh, passing beneath the inguinal ligament. The femoral nerve carries both motor (movement-controlling) and sensory (feeling-transmitting) functions.
Anatomy and Course
The femoral nerve passes through the psoas major muscle (a deep muscle of the lower back) and enters the thigh via the muscular compartment (lacuna musculorum) beneath the inguinal ligament, alongside the femoral artery and vein. Once in the thigh, it divides into several branches:
- Motor branches: These innervate the quadriceps femoris muscle (the four-headed knee extensor), the sartorius muscle, and the pectineus muscle.
- Sensory branches: These carry sensory signals from the front of the thigh and the medial (inner) side of the lower leg and foot.
- Saphenous nerve: The longest sensory branch of the femoral nerve, extending down to the medial foot.
Functions of the Femoral Nerve
The femoral nerve serves two essential roles in the human body:
- Motor function: Extension of the knee joint (e.g., during walking, climbing stairs, and standing up) and flexion of the hip joint.
- Sensory function: Perception of touch, temperature, and pain along the front of the thigh, the inner aspect of the lower leg, and the medial foot.
Conditions and Injuries of the Femoral Nerve
Femoral Neuropathy (Femoral Nerve Damage)
Damage to the femoral nerve is referred to as femoral neuropathy or femoral nerve palsy. Depending on the severity and location of the injury, it can cause motor deficits, sensory deficits, or both.
Causes
- Compression injury from prolonged positioning during surgery (e.g., lithotomy position)
- Hematomas (blood accumulations) in the pelvis or groin, e.g., following injections or vascular procedures
- Diabetic neuropathy (nerve damage due to diabetes mellitus)
- Tumors or abscesses compressing the nerve
- Trauma to the hip or groin region
- Complications following gynecological or orthopedic surgery
Symptoms
- Weakness or paralysis of the knee extensors (difficulty straightening the knee or climbing stairs)
- Reduced or absent patellar tendon reflex (knee-jerk reflex)
- Numbness, tingling, or pain along the front of the thigh and inner lower leg
- Gait disturbance or increased risk of falling
Diagnosis
Diagnosis of femoral nerve damage typically involves a combination of:
- Clinical examination: Assessment of muscle strength, reflexes, and sensation
- Electromyography (EMG) and nerve conduction studies (NCS): Electrophysiological tests to evaluate nerve function
- Imaging: MRI (magnetic resonance imaging) or ultrasound to visualize the nerve and identify possible causes such as hematomas or tumors
- Laboratory tests: E.g., blood glucose testing to rule out diabetic neuropathy
Treatment
Treatment depends on the underlying cause of the nerve damage:
- Conservative treatment: Physiotherapy and targeted muscle strengthening; pain management with medications such as anticonvulsants or tricyclic antidepressants for neuropathic pain
- Treatment of the underlying cause: E.g., optimizing blood glucose control in diabetes, or surgical evacuation of a hematoma or removal of a tumor
- Surgical treatment: In select cases (e.g., persistent compression), surgical nerve decompression may be required
- Orthotic devices: In cases of significant motor deficit, orthoses (supportive braces) can improve mobility and walking ability
Prognosis
The prognosis depends largely on the cause, severity, and duration of the nerve injury, as well as how quickly treatment is initiated. Mild compression injuries often recover fully, while severe or prolonged lesions may result in lasting deficits. Regular physiotherapy plays an important role in supporting nerve regeneration and functional recovery.
References
- Drake, R. L., Vogl, A. W., Mitchell, A. W. M.: Gray's Anatomy for Students. Elsevier, 4th edition (2019).
- Preston, D. C., Shapiro, B. E.: Electromyography and Neuromuscular Disorders. Elsevier, 3rd edition (2013).
- Ropper, A. H., Samuels, M. A., Klein, J. P.: Adams and Victor's Principles of Neurology. McGraw-Hill, 11th edition (2019).
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