SAR SH 522 Lecture Notes - Lecture 9: Shoulder Girdle, Cranial Nerves, Accessory Nerve

• School: Boston University
• Department: Speech, Language & Hearing Sciences
• Course: SAR SH 522
• Professor: Polyak

Document Summary

Cranial nerve 12 has contralateral bers no ipsilateral bers! It innervates the intrinsic laryngeal, pharynx, and soft palate muscles with cn x vagus (except for tensor veil palatine and cricothyroid). Unilateral: inability to turn head away from the side of lesion sternocleidomastoid. Restricted ability to elevate arm and drooping shoulder ipsilateral to lesion. Pure motor nerve general somatic efferent (gse): innervates all intrinsic tongue muscles and all extrinsic tongue muscles (except for palatoglossus). Umn damage will result in weakness of the tongue on the contralateral side. Lmn damage will result in weakness of the tongue on the ipsilateral side. So a l umn lesion will present the same clinically as r lmn lesion. Tongue will deviate to the weak side. Respiration is the exchange of gas between an organism and its environment. Our respiratory system has two functions: automatic life function to maintain body systems that need oxygen to survive, 2 phases of gas exchange.