ANAT 2647 Cranial Nerves COMPREHENSIVE Review

ANAT 2647 Cranial Nerves COMPREHENSIVE Review - Cranial...

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Cranial Nerves IX-XII Phillip Pearson, PhD
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- Many similarities bt spinal and cranial nerves - CN are bundles of motor or sensory fibers that innervate muscles/glands (M/E), carry impulses from sensory receptors (S/A) or combination of both (M) mainly in head and neck -CN also contain special types of neurons not found in SN (Olfaction, Vision, Hearing, Balance, Taste fibers) -CN consists of 12 pairs of nerves numbered from rostral to caudal -CN naming mnemonic: “ O n O ld O lympus' T owering T op A F inely V ested G erman V iewed A H awk” -CN identified by a descriptive name (glossopharyngeal) and Roman numeral (I-XII) -All but CNXI exit from foramen in skull CRANIAL NERVES- Overview SPINAL NERVES (SN) CRANIAL NERVES (CN)
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0. Terminal nerve ? ??? I. O lfactory (Sensory (S)) II. O ptic (S) III. O culomotor (Motor (M)) IV. T rochlear (M) V. T rigeminal (Both (B)) VI. A bducens (M) VII. F acial (B) VIII. V estibulocochlear (S) IX. G lossopharyngeal (B) X. V agus (B) XI. (Spinal) A ccessory (M) XII. H ypoglossal (M) Note: CN are sensory,motor or both sensory and motor CRANIAL NERVES - Overview 0/I II III IV V VI VII VIII IX X XI XII Basal View
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- SN contain similar fiber types from spinal cord but mainly innervate limbs and trunk -Many CN contain more than one type of neuron (motor, sensory, both/mixed) -Mnemonic for types of information CN carry: S ome S ay M oney M atters, B ut M y B rother S ays B ig B rains M atter M ore” S=sensory, M=motor, B=both -Sensory axons in CN synapse in sensory CN nucleus near brainstem (Except CN I/II) similar to sensory axons of SN synapse onto DCN or DH of SC CRANIAL NERVES - Overview SPINAL NERVES (SN) CRANIAL NERVES (CN)
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CRANIAL NERVES -Spinal Nerves’ cell bodies located in dorsal root ganglia (DRG) of the spinal cord -Connect centrally into dorsal horn (DH) of spinal cord -Connect peripherally into receptors in portion of skin (dermatome) or muscle (myotome) -Sensory CN cell bodies located in sensory ganglion and then syn in sensory nuc of brainstem -Connect peripherally into receptors DORSAL ROOT GANGLION DRG DH MEP
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- Sensory CN cell bodies are located in the sensory CN nuclei attached to cranial nerves - Motor CN cell bodies are located in the motor CN nuclei Ex: Cell bodies in CNV- Trigeminal Nerve cell bodies are in Trigeminal (Semilunar) Ganglion CRANIAL NERVES - Cranial Nerve Nuclei
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CRANIAL NERVES- Overview Optic (II) Caudate Nucleus Putamen II. Optic (S) III. Oculomotor (Motor (M)) IV. Trochlear (M) V. Trigeminal (Both (B)) VI. Abducens (M) VII. Facial (B) VIII. Vestibulocochlear (S) IX. Glossopharyngeal (B) X. Vagus (B) XI. (Spinal) Accessory (M) XII. Hypoglossal (M) Note: Last 4 CN are the medullary CN Brain Stem View Medulla
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A. First letter G = General - types of neurons found both in spinal nerves and cranial nerves. S = Special
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This note was uploaded on 11/23/2011 for the course ANAT 2647 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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ANAT 2647 Cranial Nerves COMPREHENSIVE Review - Cranial...

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