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Phonation: Structures and Process
Preparing for Communication Disorders and Sciences Master Comps
31
Anatomy
Graduate
01/19/2013

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Term
Larynx
Definition
Structure lies at the top of the trachea anterior portion of the neck. It is a valving mechanism that opens and closes as well as houses the vocal folds.
Term
Biological functions of the larynx include:
Definition
closure of the trachea so that food and other substances do not enter the lungs, production of the cough reflex to expel foreign substances that accidentally enter the trachea, and closure of the vocal folds to build subglottic pressure necessary for physical tasks.
Term
Hyoid bone
Definition
Floats under the mandible or lower jaw. the muscles of the tongue and various muscles of the mandible, skull, and larynx are attached here.
Term
Epiglottis
Definition
A protective structure. A leaf-shaped piece of cartilage medial to the thyroid cartilage and hyoid bone.
Term
Thyroid cartilage
Definition
Forms the anterior and lateral walls of the larynx and protects the larynx.
Term
Cricoid cartilage
Definition
Some view as the uppermost tracheal ring and is linked with the thyroid cartilage and the paired arytenoid cartilages. It completely surrounds the trachea.
Term
Arytenoid cartilages
Definition
small, pyramid-shaped cartilages connected to the cricoid through the cricoarytenoid joint, which permits sliding and circular movements.
Term
Corniculate cartilages
Definition
sit on the apex of the arytenoids and assist in reducing the laryngeal opening when a person is swallowing.
Term
Cuneiform cartilages
Definition
tiny cone-shaped cartilages which are located under the mucous membrane that covers the aryepiglottic folds. Serves to stiffen or tense the aryepiglottic folds.
Term
Intrinsic Laryngeal Muscles
Definition
Primarily responsible for controlling sound production. Muscles include: thyroarytenoid, lateral cricoarytenoid, transverse arytenoid, oblique arytenoid, cricothyroid, and posterior cricoarytenoid.
Term
Thyroarytenoid
Definition
is attached to the thyroid and arytenoid cartilages.
Term
Internal thyroarytenoid
Definition
generally referred to as the vocalis muscle or more commonly the vocal folds.
Term
Adductor muscles
Definition
lateral cricoarytenoid, transverse arytenoid, and oblique arytenoid.
Term
Cricothyroid muscle
Definition
attached to the cricoid and thyroid cartilages. It lengthens and tenses the vocal folds.
Term
Vocal fold adduction
Definition
is supported when the oblique and transverse arytenoid muscles contract and pull the arytenoids closer together.
Term
Vocal fold abduction
Definition
accomplished when the posterior cricoarytenoid muscle contracts.
Term
Posterior cricoarytenoid
Definition
abducts the vocal folds
Term
lateral cricoarytenoid
Definition
adducts the vocal folds, increases medial compression.
Term
Oblique arytenoid
Definition
pulls the apex of arytenoids in a medial direction.
Term
Glottis
Definition
It is not anatomical structure but a name of a space that is created when the vocal folds are abducted.
Term
Extrinsic Laryngeal Muscles
Definition
Attached to the hyoid bone and lower or raise the position of the larynx within the neck.
Term
Suprahyoid muscles
Definition
Known as elevators that lie above the hyoid bone. Primary function is elevation of the larynx.
Term
Digastric, Geniohyoid, Mylohyoid, stylohyoid, hypglossus, and genioglossus.
Definition
Suprahyoid muscles
Term
Infrahyoid muslces
Definition
Known as depressors that lie below the hyoid bone. Primary function is depression of the larynx.
Term
Thyrohyoid, omohyoid, sternothyroid, and sternohyoid.
Definition
Infrahyoid muscles
Term
Epithelium, lamina propria, vocalis muscle are...
Definition
three layers of the vocal folds.
Term
Aryepiglottic folds
Definition
a ring of connective tissue and muscle extending from the tips of the arytenoids to the larynx. Separates the laryngeal vestibule from the pharynx and help preserve the airway.
Term
Ventricular, or false vocal folds
Definition
vibrate at very low fundamental frequencies and usually not during phonation in a normal speaker. Compress during such activities as coughing and lifting heavy items.
Term
Myoelastic-aerodynamic theory
Definition
vocal folds vibrate because of the forces and pressures of air and the elasticity of the vocal folds.
Term
Bernoulli effect
Definition
caused by the increased speed of air passing between the vocal folds, is the "sucking" motion of the vocal folds toward one another.
Term
Primary cortical areas involved in speech-motor control
Definition
primary motor cortex, broca's area, somatosensory cortex, and supplementary motor cortex.
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