Health Sciences 2300A/B Lecture Notes - Lecture 5: Suprahyoid Muscles, Middle Ear, Vocal Folds

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Christopher William James Melling

Document Summary

Intrinsic muscles of tongue are important to speech (pronunciations) and chewing (moves food around the cavity), but are not prime movers of the jaw. Important in movement of tongue: main nerve is the hypoglossal nerve (cn-12) Genioglossus: genio - refers to the chin, attaches from the inner side of the mandible to the tongue, brings the tongue forward, we do this when we swallow to allow food into our throat. Hyoglossus: hyoid bone to the tongue, depresses/lowers the tongue, pulls the tongue down from the sides of the tongue. Styloid process to the tongue: elevates the tongue. Palatoglossus: attaches from the soft palette to the tongue, brings the soft palette down and the tongue up. Important in swallowing: vagus nerve innervation, primary nerve of the parasympathetic nervous system (rest and digest, vagus nerve is responsible for the gag reflex, pulling trig, touch the soft palette, stimulates the gag reflex, calls upon many muscles.