Mastoid canaliculus

Mastoid Canaliculus

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Diagram of the temporal bone showing the mastoid canaliculus.

The mastoid canaliculus is a small anatomical feature located in the temporal bone of the human skull. It is a narrow passage that plays a crucial role in the innervation of the ear, specifically by transmitting the auricular branch of the vagus nerve.

Anatomy

The mastoid canaliculus is situated in the mastoid portion of the temporal bone. It begins at the jugular fossa, which is a depression in the temporal bone that accommodates the jugular bulb. From the jugular fossa, the canaliculus extends laterally and slightly superiorly to open into the tympanic cavity.

Function

The primary function of the mastoid canaliculus is to provide a pathway for the auricular branch of the vagus nerve (also known as the Arnold's nerve) to reach the skin of the ear. This nerve branch is responsible for supplying sensory innervation to the posterior part of the external ear and the external auditory canal.

Clinical Significance

Understanding the anatomy of the mastoid canaliculus is important in various medical fields, including otolaryngology and neurosurgery. Damage to the structures passing through this canaliculus, such as during surgical procedures involving the temporal bone, can lead to sensory deficits in the ear.

Related Pages

• Temporal bone
• Vagus nerve
• Arnold's nerve
• Tympanic cavity