Vocal Cords
www.propofology.com
Dr. David Lyness
@Gas_Craic
THE ANATOMY OF LARYNGOSCOPY
LOADING AWESOME
TRUE VOCAL CORDS
FALSE/VENTRICULAR
CORDS
ARYEPIGLOTTIC
FOLD
EPIGLOTTIS
(PROTRUDING FORWARD)
CORNICULATE
CARTILAGE
CUNEIFORM
CARTILAGE
PYRIFORM
FOSSA
LOADING AWESOME
There are two primary groups of laryngeal muscles, extrinsic and instrinsic.
8 Extrinsic = attach to a site within the larynx and to a site outside of the larynx. Suprahyoid and Infrahyoid groups.
The suprahyoid group includes the stylohyoid, mylohyoid, geniohyoid, and digastric muscles - these RAISE the larynx
Infrahyoid group includes the sternothyroid, sternohyoid, thyrohyoid, and omohyoid muscles - these LOWER the hyoid bone and larynx
5 Intrinsic = both of their attachments are within the larynx = CLOSE the cords (but post. cricoarytenoid abducts and opens)
Include the interarytenoid, lateral cricoarytenoid, posterior cricoarytenoid, cricothyroid, and thyroarytenoid (true vocal cord) muscles.
The suprahyoid group includes the stylohyoid, mylohyoid, geniohyoid, and digastric muscles - these RAISE the larynx
Infrahyoid group includes the sternothyroid, sternohyoid, thyrohyoid, and omohyoid muscles - these LOWER the hyoid bone and larynx
5 Intrinsic = both of their attachments are within the larynx = CLOSE the cords (but post. cricoarytenoid abducts and opens)
Include the interarytenoid, lateral cricoarytenoid, posterior cricoarytenoid, cricothyroid, and thyroarytenoid (true vocal cord) muscles.
All of the intrinsic muscles are paired (right and left) with the exception of the transverse interarytenoid.
All of the intrinsic laryngeal muscles work together to adduct the vocal cords with the exception of the posterior cricoarytenoid, which is the only
All of the intrinsic laryngeal muscles work together to adduct the vocal cords with the exception of the posterior cricoarytenoid, which is the only
muscle that abducts the vocal cords.
Image: www.voicedoctor.net
