The mandibular nerve (V3) is the largest of the three divisions of the trigeminal nerve, the fifth cranial nerve (CN V).
|From||Trigeminal nerve CN V|
|Anatomical terms of neuroanatomy|
The large sensory root emerges from the lateral part of the trigeminal ganglion and exits the cranial cavity through the foramen ovale. Portio minor, the small motor root of the trigeminal nerve, passes under the trigeminal ganglion and through the foramen ovale to unite with the sensory root just outside the skull.
The mandibular nerve immediately passes between tensor veli palatini, which is medial, and lateral pterygoid, which is lateral, and gives off a meningeal branch (nervus spinosus) and the nerve to medial pterygoid from its medial side. The nerve then divides into a small anterior and large posterior trunk.
The anterior division gives off branches to three major muscles of mastication and a buccal branch which is sensory to the cheek. The posterior division gives off three main sensory branches, the auriculotemporal, lingual and inferior alveolar nerves and motor fibres to supply mylohyoid and the anterior belly of the digastric muscle.
The mandibular nerve gives off the following branches:
- From the main trunk of the nerve (before the division)
- From the anterior division
- From the posterior division
The mandibular nerve innervates:
(Motor Innervation - Muscles of mastication)
- Masseteric nerve
- Medial pterygoid nerve
- Tensor Veli Palatini Nerve
- nervous spinosus (sensory) from foramen spinosum
- Lateral pterygoid nerve
- Deep temporal nerve
(Sensory Innervation - NOT Taste)
Inferior Alveolar Split