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Cranial Nerves (accessible).pdf - Cranial Nerves Prof. Lisa...

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Cranial NervesProf. Lisa Garcia
The Cranial Nerves (CN)Named because they exit fissure within the cranium & arefound on the brainstem/brainCan besensory,motor, or acombinationof these(both)12 pairs, numbered I – XII (from rostral to caudal)Yes – you have to use Roman Numerals.Their names can reflect the general distribution orfunctionsCranial Nerves carry one or more of the following5functional components:1) Somatic Motor,2) Visceral Motor,3) SomaticSensory,4) Visceral Sensory& 5) Special
Cranial Nerve Functions: EfferentMotor (efferent) Fibers1) Motor innervation of striated(voluntary) muscleSomatic Motor (GSEfibers)Branchial Motor (derived from thepharyngeal arches) (SVEfibers)2) Motor innervation of glands(involuntary)Visceral Motor (GVEfibers)Cranial outflow (parasympathetic)
PharyngealArches
Cranial Nerve Functions: AfferentSensory (afferent) Fibers3) Fibers conveying sensation from thevisceraVisceral sensory (GVAfibers)Carotid body/sinus, resp & GItract4) Fibers transmitting general sensationfrom skin & mucous membranesGeneral sensory (GSAfibers)Touch, heat, pressure
Cranial Nerve Functions: SpecialAfferent FibersSensory (Afferent) Fibers5) Fibers transmitting unique sensationsSpecial sensory (SSA&SVAfibers)SSA = hearing, balance,equilibrium, visionSVA = taste & smellNote: See slide 47 for abbreviationdefinitions.
Summary of theNervous System
O - ohO - ohO - ohT - toT - touchA - andF - feelV - veryG - goodV -velvetAH
Olfactory Nerve (CN I)Cranial Exit:Cribriform plate foramina in the EthmoidboneMain Action:Smell from nasal mucosa (sensory)Consists of an olfactory bulb & tract (anteriorextensions of the forebrain)Clinical Correlation:Anosmia (loss of smell)Generally will occur with age, also causes analteration of tasteThere are some motor fibers (but we won't count them)associated with the sense of smell adapting (ie in thecadaver lab)
Olfactory Bulb and Tract
Optic Nerve (CN II)Cranial Exit:Optic canalMain Action:Vision from the retina (sensory)Paired anterior extensions of the forebrain, alsosurrounded by the cranial meninges & subarachnoid space

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Term
Summer
Professor
alliston
Tags
Motor nerve, Accessory nerve, vagus nerve, trigeminal nerve, Vestibulocochlear nerve

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