Superior labial nerve

Superior Labial Nerve

Diagram of the superior labial nerve and its branches.

The superior labial nerve is a branch of the infraorbital nerve, which itself is a continuation of the maxillary nerve, a division of the trigeminal nerve (cranial nerve V). This nerve is responsible for providing sensory innervation to the upper lip and the adjacent region of the face.

Anatomy

The superior labial nerve arises from the infraorbital nerve as it exits the infraorbital foramen located below the orbit of the eye. It travels downward and forward, supplying the skin and mucous membrane of the upper lip. The nerve also provides sensory branches to the nasal septum and the anterior part of the nasal cavity.

Function

The primary function of the superior labial nerve is to convey sensory information from the upper lip to the brain. This includes sensations of touch, pain, and temperature. The nerve plays a crucial role in the sensory perception of the upper lip, which is important for functions such as speaking, eating, and facial expressions.

Clinical Significance

Damage to the superior labial nerve can result in loss of sensation or numbness in the upper lip. This can occur due to trauma, surgical procedures, or nerve compression. Understanding the anatomy of the superior labial nerve is important for surgeons performing procedures in the maxillofacial region to avoid inadvertent nerve injury.

Related Pages

• Trigeminal nerve
• Maxillary nerve
• Infraorbital nerve
• Facial nerve