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6- Cranial Nerves I & II .pdf - CRANIAL NERVES Dr. Rasha...

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CRANIAL NERVESDr. Rasha ElmansyReference: Snell's Clinical Neuroanatomy, 8thEdition
ObjectivesAt the end of the lecture, the students should be ableto:- Name the cranial nerves and describe each one asregard to origin, nuclei, type, course and distribution.- Mention different functional components in each ofthe cranial nerves- Outline the effects of common lesions of cranialnerves..
Cranial nerves nuclei form7 columns in the brain stem (3 motor and4 sensory). Each column is responsible for special type of fibers .They are arranged as follows from medial to lateral :1)General Somatic efferent(GSE) column:motor to muscles derived from theoccipital myotomes. ( extra-occular muscles and tongue muscles).Nucleus of occulomotor and trochlear in the mid brain.Nucleus of abducent in the pons.Nucleus of hypoglossal in the medulla.2)Special visceral efferent(SVE)column:branchiomotor supplying the musclesderived from thepharyngeal arches.Motor nucleus of trigeminal in the pons…..supplying muscles derived from1starch.Facial nucleus supplying muscles of 2ndarch.Nucleus ambiguus (9,10,11 nerves)- Glossopharyngeal nerve supplying 3rdarch……stylopharyngeus muscle- Vagus and cranial accessory supplying muscles derived from 4thand 6tharches…..muscles of palate pharynx and larynx.Functional Components of Cranial Nerves
3) General visceral efferent(GVE) column:these arepreganglionic parasympathetic cells.-Edinger Westephal nucleus ofocculomotorto ciliaryand sphincter pupillae muscles.-Superior salivatory of facialto submandibular andsublingual salivary glands.-Special lacrimatory of facialto lacrimal gland.-Uncertain nucleus of facialto supply glands present inpharynx larynx and nose..-Inferior salivatory nucleus of glosso-pharyngealtoparotid gland-Dorsal vagal nucleussupply organs in the abdomen
4)General visceral afferent(GVA) column:receivessensation from the viscera(dorsal vagal nucleus).5)Special visceral afferent(SVA) column:-Nucleus solitarius receivestaste sensation via 7,9,10nerves.6)General somatic afferent(GSA) column:- sensation from the faceNuclei of trigeminal nerve.7)Special somatic afferent(SSA) column:-Cochlear and vestibular nuclei.-Optic and olfactory nerveshave similar function butthey are not attached to brain stem
Functional Components of Cranial Nerves
The Cranial Nerves3,4,6(Occulomotor, Trochlear & Abducent)
The3rd, the 4thand the 6thnerve motor nucleireceive:Corticonuclear fibersfrom both cerebralhemispheres.Tectobulbar fibersfrom superior colliculus.Fibers frommedial longitudinal fasciculus(MLF) by which the nuclei are connected to eachother.
Occulomotor NerveType:MotorFibers:General Somatic efferent(GSE)and General visceral efferent(GVE)Has two nuclei:Main occulomotor nucleus;located in the mid brain, at the level ofsuperior colliculus , divided into 4parts to supply 4 musclesAccessory nucleus (Edinger-Westphalnucleus);situateddorsal to the main motornucleus,

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Term
Spring
Professor
KathrinL.Engisch
Tags
Facial nerve

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