Mandibular foramen


The mandibular foramen is an opening on the internal surface of the ramus of the mandible for divisions of the mandibular nerve and blood vessels to pass through.

Structure

The mandibular foramen is an opening on the internal surface of the ramus of the mandible for divisions of the mandibular nerve and blood vessels to pass through.

Variation

There are two distinct anatomies to its rim.
Rarely, a bifid inferior alveolar nerve may be present, in which case a second mandibular foramen, more inferiorly placed, exists and can be detected by noting a doubled mandibular canal on a radiograph.

Function

The mandibular nerve is one of three branches of the trigeminal nerve, and the only one having motor innervation.
One branch of it, the inferior alveolar nerve as well as the inferior alveolar artery enter the foramen traveling through the body in the mandibular canal and exit at the mental foramen on the anterior mandible at which point the nerve is known as the mental nerve.
These nerves provide sensory innervation to the lower teeth, as well as the lower lip and some skin on the lower face.

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