2nd only to vagus as the “busiest” cranial nerve of the human body.
Nerve of the 2nd branchial arch
The facial nerve consists of the facial nerve proper and the intermedius nerve
Both the facial nerve and the intermedius nerve emerge from the CNS in the cerebellopontine angle at the caudal border of the pons, b/w the abducens nerve and the vestibulocochlear nerve.
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TRIGEMINAL NERVE ( CN V)
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Sensory component has 3 divisions :
Ophthalmic
Maxillary
Mandibullar
Motor and principal sensory nuclei :
Midpons
Spinal tract and nuclei( pain, temp) pons to upper cervical cord.
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NUCLEI
A cranial nerve nucleus a collection of neurons( gray matter) in the brain stem that is associated with one or more cranial nerves.
Axons carrying information to and from the CN form a synapse first at these nuclei
Lesions occuring at these nuclei can lead to effects resembling those seen by the severing of nerves they are associated with.
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MOTOR NUCLEUS
Innervates muscles of :
Mastication
Tensor Tympani
Tensor Palatain
Derived from first branchial arch
Located in pons medial to principle sensory nucleus.