6,273
edits
Changes
Cranial Nerves - Anatomy & Physiology (view source)
Revision as of 14:34, 11 August 2011
, 14:34, 11 August 2011→Facial nerve (VII)
During a clinical examination, medial deviation stribismus may indicate a problem with this nerve.
During a clinical examination, medial deviation stribismus may indicate a problem with this nerve.
===Facial nerve (VII)===
===Facial nerve (VII)===
The facial nerve is part of the cranial nerve group responsible for the innervation of structures originating from the branchial arches.
The facial nerve is part of the cranial nerve group responsible for the innervation of structures originating from the branchial arches. It originates from the medulla oblongata and from the second branchial arch. It has a common dura sheet with the opthalmic (V1) branch of the trigeminal nerve. The facial nerve is of a mixed composite and is made up of a number of different fibre types. It has a '''general somatic efferent fibre''' within the ear canal, a '''general visceral efferent fibre''' acting under parasympathetic control to some salivary glands, lacrimal glands, nasal cavity and palate, a '''special visceral afferent fibre''' providing taste to the rostral 2/3 of the tongue and finally it has a '''general somatic efferent fibre''' supplying motor function to the muscles of facial expression.
<br />
<br />
The facial nerve enters the petrosal bone via the '''internal acoustic meatus''' along with the vestibulocochlear nerve. The facial nerve also runs inside the '''facial canal'''.
===Vestibulocochlear nerve (VIII)===
===Vestibulocochlear nerve (VIII)===