SLHS 3116 Lecture Notes - Lecture 13: Cricothyroid Muscle, Lamina Propria, Vocal Folds
14 Feb 2020
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Document Summary
Differ in stiffness which allows the vocal folds to vibrate. 1st layer: epithelium (just skin, not pigmatised/pearly white) Lamina propria (several layers) - stiffness increases from superficial to deep. When hypercontracted: make the whole thing become stiffer (bad thing) Cricothyroid muscle (innervated by the superior branch of the laryngeal nerve) Main goals of the intrinsic laryngeal muscles are: Changes the shape of the glottis (not the vocal folds themselves) Laryngeal depressor: pulls the larynx down towards the sternum. Could lift on sternum to assist with breathing - consequence: tension in larynx, horse voice. Action: depresses tongue and/or elevates the hyoid. Action: sidewall of lower pharynx moves inward, thereby decreasing the size of the. Insertion: sides of the cricoid and thyroid cartilages lower pharyngeal cavity and/or elevating the larynx. Changing shape (all innervated by the recurrent nerve) Cross-sectional thickness can be changed by the vocalis muscle to increase or decrease the amount of contact.
