Anatomy Notes

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Department
Anatomy and Cell Biology
Course
Anatomy and Cell Biology 3319
Professor
Peter Merrifield
Semester
Fall

Description
Anatomy NotesOct 2711 There are 12 pairs of cranial nerves numbered in a rostral to caudal direction that attach to the brain and pass through foramina in the skull They are peripheral nerves The first two pairs attach to the forebrain the rest to the brain stem The vagus nerve extends to the abdomen but all the other ones innervate only the head and neck CNS vs PNSCNSbrainspinal cord PNScranial nervesspinal nerves 1 Olfactory2 Optic3 Oculomotor4 Trochlear5 Trigeminal 6 Abducens 7 Facial 8 Vestibulocochlear 9 Glossopharyngeal 10 Vagus 11 Accessory 12 HypoglossalWhy are cranial nerves important Provides nervous innervation to head and neck Somatic motorex eye movements mastication facial expression tongue movement General sensoryex touch pain temperature Special sensoryex taste vision smell Parasympathetic visceral motorex pupillary constriction lens focusing salivary and lacrimal glands Cranial nerves originate from within the craniumventral surface of the brain forebrain ventral surface of the brainstem ExceptionsTrochlear originates from the dorsal surface of the brainstem Accessory originates mostly from the spinal cord CNI and CNIIventral surface of brain The olfactory bulb is located in the forebrain it contains secondary neurons and it is where olfactory nerves CNI terminate after they have passed through the cribriform plate of ethmoid bone These fibres then form the olfactory tract which contains the axons of the second
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