CDO 335 Week Nine Lecture Notes
CDO 335 Week Nine Lecture Notes CDO 335
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This 0 page Class Notes was uploaded by Rachel Roede on Monday November 2, 2015. The Class Notes belongs to CDO 335 at Central Michigan University taught by Lori Bissell in Summer 2015. Since its upload, it has received 45 views. For similar materials see Anatomy & Physiology of Speech and Hearing in Communication Disorders & Sciences at Central Michigan University.
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Date Created: 11/02/15
CDO 33 Week Nine Lecture Notes Cricoid Cartilage Signetring shaped Inferior to thyroid and arytenoids MOST inferior Sits atop of the rst tracheal ring Landmarks o Anterior arch Thinner portion on the front 0 Posterior Lamina Where the arytenoid cartilages sit Arytenoids Threesides pyramid shaped 2 Rests on the posterior portion of cricoid Attaches directly to vocal folds Most moveable of all cartilages Rotate medially and inferiorly Landmarks o Apex Superior portion where corniculate cartilages sit o Muscular Process Lateral projections where muscles attach laryngeal muscles 0 Vocal Process Medial projection where vocal folds attach Corniculates Sit atop of arytenoids Do not articulate independently No muscular attachments or articulations Adds height to arytenoids Cuneiforms No muscular attachments or articulations Strengthen the aryepiglottic folds Intrinsic Muscles of the Larynx Landmarks of the Larynx Epiglottis Aryepiglottic folds o Membrane extending from arytenoid cartilage to epiglottis Laryngeal Aditus o Entryway into larynx o Uppermost superior space Laryngeal Vestibule 0 Opening of larynx below epiglottis and aditus but above the false vocal folds Ventricular FoldsFalse Vocal Folds 0 Located between the laryngeal vestibule and the laryngeal ventricle Ussues o Helps close off the airway o Are not used for vocal production 0 Strictly there for airway protection Laryngeal Ventricle 0 Lateral space between the true and false vocal folds True vocal folds o AKA Thyroarytenoid muscles 0 Sits right on top of the airway Cricothyroid membraneligament o AKA Conus Elasticus o Attaches cricoid cartilage to the thyroid Glottis 0 Space between true vocal folds 0 Size of glottis should change largest when breathing because airway needs to be wide open Pyriform sinuses 0 Shallow depressions lateral to aryepiglottic folds at level of vocal folds 0 Food sits here if there is premature spillage Structure of the Vocal Folds 5 layers 0 1 Sduamous Epithelium Most super cial Extremely thin Glistening white portion Aids in hydration by retention of uid o Lamina Propria Connective tissue Comprised of 3 layers 0 2 Suberficial Laver of Lamina Prooria 0 Very elastic made of elastic bers 0 AKA Reinke s Space Reinke s Edema swollen with uid conditions usually due to smoking 0 3 Intermediate Layer of Lamina Propria 0 Elastic bers 0 4 Deep Layer of Lamina Propria o Collagen bers support elasticity and structure 5 Thvrovocalis Muscle Deep to lamina Propria Makes up the bulk of vocal folds Is what contracts for adduction and abduction Thyroarytenoid Muscle Thyrovocalis 0 Origin Angle of the thyroid Dorsal inner surface 0 Course Back posteriorly o Insertion Vocal process of the arytenoid 0 Function know for exam Independently relaxes vocal folds Cooperatively tenses vocal folds o Innervation know for exam Recurrent Laryngeal Branch of X Vagus Nerve ThvromuscuIaris o Lies lateral to the Thyrovocalis 0 Origin Angle of the thyroid Dorsal inner surface 0 Course Back posteriorly o Insertion Base and muscular process of arytenoids 0 Function know for exam Relaxes the vocal folds o Innervation know for exam Recurrent Laryngeal Branch of X Vagus Nerve Posterior Cricoarytenoid Muscle 0 Only glottal abductor Lateral and medial bundles Origin 0 Posterior lamina of cricoid cartilage Course 0 Obliquely up different from book Insertion o Muscular process of arytenoid different from book 0 Function especially lateral bundle o Abduct the vocal folds 0 ONLY abductor o Pulls back on arytenoids Innervation o Recurrent Laryngeal Branch of X Vagus Nerve Lateral Cricoarytenoid Origin 0 Upper and lateral borders of cricoid arch Course 0 Up and back Insertion o Muscular process of arytenoid Function 0 Adducts the vocal folds o Pulls forward on the arytenoid Innervation o Recurrent Laryngeal Branch of X Vagus Nerve lnterarytenoid Transverse Arvtenoid 1 0 Origin Lateralposterior surface of one arytenoid 0 Course TransverselyacrosslateraIly o Insertion Opposite lateralposterior surface of other arytenoid 0 Function Adduct vocal folds Pulls the arytenoids together 0 Innervation Recurrent Laryngeal Branch of X Vagus Nerve Oblidue Arvtenoid 0 Origin Posterior base of muscular process of one arytenoid 0 Course Obliquer up 0 Insertion Apex of other arytenoid 0 Function Adduct vocal folds Pulls arytenoids together 0 Innervation Recurrent Laryngeal Branch of X Vagus Nerve Cricothyroid 2 sections Pars Recta Pars Oblique 0 Origin Pars Recta anterior surface of cricoid beneath arch Pars Oblique anterior surface of cricoid beneath arch lateral to pars recta 0 Course Pars Recta up and out Pars Oblique obliquely up 0 Insertion Pars Recta lower laminae of the thyroid Pars Oblique between laminae and inferior horns of thyroid 0 Function Pulls thyroid forward and down Lengthens vocal folds Increases vocal fold tension Changes pitch 0 Innervation Superior Laryngeal Branch of X Vagus Nerve Recurrent Laryngeal Branch Nerve Damage 0 Problems with adduction and abduction Sound hoarseraspy breathy low volume quietweak Higher risk for aspiration Superior Laryngeal Branch Nerve Damage Pitch Decreased pitch variability Pharyngeal Branch Nerve Damage 0 Soft palate won39t move up Nasality increases hypernasality
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