Intrinsic_Extrinsic_Suppl Muscles of Larynx

Intrinsic_Extrinsic_Suppl Muscles of Larynx - Forces of the...

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Unformatted text preview: Forces of the laryngeal apparatus Passive forces Natural recoil of muscles, cartilages, and connective tissues Active force Involves muscle contraction Intrinsic muscles Both ends within larynx Extrinsic One end within larynx, one end outside Supplementary Influence larynx via attachments to hyoid bone Intrinsic Laryngeal Muscles Responsible for changing the position of the structures of the larynx 3 general categories Adductors Abductors Tensors/relaxors Thyroarytenoid (TA) forms the bulk of each vocal fold from interior thyroid to vocal process and anterior surface of arytenoid tensor applies isometric tension if CT is contracted relaxor only if CT is not contracted draws arytenoids anteriorly, shortening vocal folds and decreasing F0 Described as having 2 distinct parts External thyroarytenoid (thyromuscularis) Lateralmost portion of vocal fold Internal thyroaryntenoid (thyrovocalis/vocalis) Flanks vocal ligament Some evidence that 2 parts may function differently Posterior cricoarytenoid (PCA) Abductor from medial aspect of posterior cricoid to muscular process of arytenoid pulls muscular process back and down,...
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This note was uploaded on 11/13/2010 for the course CODS 361 taught by Professor Gel during the Spring '10 term at WPUNJ.

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Intrinsic_Extrinsic_Suppl Muscles of Larynx - Forces of the...

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