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ANAT 2646 Exam 3 Review - CN V VII IX and X carry GSA input...

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CNS EXAM 3 CRANIAL NERVES There are 12 pairs of cranial nerves emerging from the brain and radiating from it’s surface. They exit the cranium through foramina or fissures and distribute their innervation to their respective structures in the head and neck. The optic nerve is really an outgrowth of the brain that emerges from the prosencephalon and part of the spinal accessory nerve arises from the cervical spinal cord. Therefore, there are 9 pairs that arise from the brainstem. I Olfactory Nerve II Optic Nerve III Oculomotor Nerve IV Trochlear Nerve V Trigeminal Nerve VI Abducens Nerve VII Facial Nerve VIII Vestibulocochlear Nerve IX Glossopharyngeal Nerve X Vagus Nerve XI Accessory Nerve XII Hypoglossal Nerve Functional Components GSA – carry general sensation from cutaneous structures and mucous membranes of the head and general proprioception from somatic structures.
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Unformatted text preview: CN V, VII, IX, and X carry GSA input to the spinal nucleus of the trigeminal nerve. • GSE – general motor innervation to skeletal muscles derived from embryological somites. CN III, IV, and VI innervate the extraocular muscles, and CN XII innervates muscles of the tongue. • GVA – general sensation from the viscera carried by CN VII, IX, and X. • GVE – visceral motor (parasympathetic) innervation. CN III, VII, IX, and X. • SSA – special sensory input from the eye and ear. CN II and VIII • SVA – special sensory of taste and smell from the viscera. CN I, VII, IX, and X • SVE – special motor innervation to skeletal muscles derived from branchial arches. CN V, VII, IX, and X (and XI?) See handout for CN information....
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