EDSP 161 Study Guide - Midterm Guide: Upper Motor Neuron Syndrome, Vagus Nerve, Recurrent Laryngeal Nerve

• School: SJSU
• Department: Education - Communicative Disorders and Sciences, Department of
• Course: EDSP 161
• Professor: Anita Schaak

Document Summary

Provide motor and sensory innervation for head and neck. Most originate in brainstem cranial nerves involved in smell and vision - cn i - olfactory nerve. Cn vi - abducens nerve cranial nerves involved in speech, hearing, and swallowing - cn v - trigeminal nerve. Cn xii - hypoglossal nerve lower motor neurons - -all motor cranial nerves are lower motor neurons. Final common pathway alpha motor neurons - -lower motor neurons. This and their axons are the only connection between the cns and muscle. Innervate extramural muscle fibers involved in muscle contraction. Final common pathway - -last leg of motor signals journey. Cn xii (to contralateral tongue side) bilateral umn innervation - cn i, ii, iii, iv, v, vi, viii, ix, x unilateral umn lesions - does not remarkably impair function of associated structures. Innervates superior obliques; turns eye downward and laterally. Has 3 divisions three divisions of the cn v - 1. ophthalmic: maxillary, mandibular.