SLHS 3116 Lecture Notes - Lecture 12: Thyroarytenoid Muscle, Arytenoid Muscle, Lateral Cricoarytenoid Muscle
14 Feb 2020
School
Department
Course
Professor
Document Summary
Hirano and his colleagues, through the use of electron microscopy, found that the vocal fold is actually made up of 5 layers. Layers differ in their cellular compositions and mechanical properties. The epithelium: thin and tough tissue, determines the outer shape of the vocal folds. Thyroarytenoid muscle: thickest and densest than all other layers. Way of grouping 5 layers to think about 3 most flexible as cover and deep layer and muscle as the body. Aka: primary muscular component of vocal folds. Vocalis -> medial position compared to the glottis; what"s closest to middle of throat. Muscularis -> toward the side of the throat. Muscles inside the laryngeal superstructure (all the cartilages we talked about previous lectures) Adduction: to bring together; what brings the vocal folds into their closed position: lateral crico-arytenoid. Action: adduction (movement of the arytenoid inward and downward) Paired: one on each side of the larynx. Origin: posterior surface of one arytenoid cartilage.
