Medial dorsal cutaneous nerve

Diagram of the nerves of the foot, including the medial dorsal cutaneous nerve.

The medial dorsal cutaneous nerve is a branch of the superficial peroneal nerve that supplies sensation to the skin on the dorsum of the foot. It is an important nerve in the peripheral nervous system and plays a crucial role in the sensory innervation of the foot.

Anatomy

The medial dorsal cutaneous nerve arises from the superficial peroneal nerve, which is a branch of the common peroneal nerve. The common peroneal nerve itself is a division of the sciatic nerve.

Origin

The medial dorsal cutaneous nerve originates from the superficial peroneal nerve as it descends in the lower leg. The superficial peroneal nerve travels down the lateral compartment of the leg and becomes superficial in the lower third of the leg.

Course

The nerve travels anteriorly and inferiorly, emerging from the fascia in the lower leg to become subcutaneous. It then continues down the dorsum of the foot.

Branches

The medial dorsal cutaneous nerve divides into two main branches:

• A medial branch that supplies the skin on the medial side of the foot and the adjacent sides of the first and second toes.
• A lateral branch that supplies the skin on the dorsum of the foot.

Function

The primary function of the medial dorsal cutaneous nerve is to provide sensory innervation to the skin on the dorsum of the foot. It is responsible for transmitting sensory information such as touch, pain, and temperature from the skin to the central nervous system.

Clinical Significance

Injury to the medial dorsal cutaneous nerve can result in sensory deficits in its area of distribution. This can occur due to trauma, surgical procedures, or compression injuries. Symptoms may include numbness, tingling, or pain on the dorsum of the foot.

Related Pages

• Superficial peroneal nerve
• Common peroneal nerve
• Sciatic nerve
• Peripheral nervous system