Health Sciences 2300A/B Lecture Notes - Lecture 15: Hypoglossal Nerve, Vagus Nerve, Hyoglossus

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Jamie Melling

Document Summary

Intrinsic muscles of tongue important to speech & chewing, not prime movers of the jaw. Many functions of tongue, involved in chewing, move tongue around. Not involved in moving the jaw, important for speech. Tongue has to move around to allow entrance of food. Movement of the eye is a very complicated process, involved many muscles. Inferior rectus muscle, multiple directions (arrows), primary role: press the eye, secondary functions: adduct the eye, towards nose. Lots of functions, but some not primary functions. 6 muscles, action are not primary roles. Inferior rectus- underneath the eye, depress the eye: medial rectus- adduct the eye, bring towards midline, lateral rectus- abduct the eye. Pharyngeal constrictors and assisting muscles- constrict the muscles into the sockets and shortens the pharyngeal space. Made up of two layers- circular and longitudinal layers, longitudinal one in the inside, circular one are the constrictors.