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Cranial Nerves - Anatomy & Physiology (view source)
Revision as of 14:43, 11 August 2011
, 14:43, 11 August 2011→Facial nerve (VII)
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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'''.
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'''. There are a number of intermediate branches which seperate from the main facial nerve inside the facial canal including the '''greater petrosal nerve''', the '''stapedial nerve''' (motor) and the '''chorda tympani'''. These then emerges via the '''stylomastoid foramen''' at the caudoventral aspect of the skull.
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There are also numerous external branches of the facial nerve once the facial nerve has left the facial canal. These include the '''internal auricular nerve''', the '''auriculopalpebral nerve''', the '''rostral auricular nerve''', the '''palpebral nerve''', the dorsal buccolabial nerve''', the '''ventral buccolabial nerve''', the '''ramus colli''', the '''digastric nerve''', the '''stylohoid nerve''' and the '''caudal auricular nerve'''.
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The facial nerve supplies motor innervation to the muscles of facial expression. These are superficial flat, thin muscles that opriginate from bony areas of fascia and then radiate out around the skin. They may also often from sphincters such as around the mouth and eye.
===Vestibulocochlear nerve (VIII)===
===Vestibulocochlear nerve (VIII)===