larynx

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larynx

 [lar´ingks] (Gr.)
the muscular and cartilaginous structure, lined with mucous membrane, situated at the top of the trachea and below the root of the tongue and the hyoid bone; it contains the vocal cords and is the source of the sound heard in speech. The larynx is part of the respiratory system; air passes through it traveling from the pharynx to the trachea on its way to the lungs and again returning to the exterior.

The larynx is composed of nine cartilages that are held together by muscles and ligament: the single thyroid, cricoid, and epiglottic cartilages and the paired arytenoid, corniculate, and cuneiform cartilages. (See also color plates.) The largest of these, the thyroid cartilage, forms the Adam's apple, which protrudes in the front of the neck. Two flexible vocal cords reach from the back to the front wall of the larynx and are manipulated by small muscles to produce sound. The epiglottis, a flap or lid at the base of the tongue, closes the larynx as it is lifted up during swallowing and so prevents passage of food or drink into the larynx and trachea.
Larynx.
artificial larynx an electromechanical device that enables a person after laryngectomy to produce speech. When the device is placed against the region of the laryngectomy a buzzing sound is made that can be converted into simulated speech by movements of the lips, tongue, and glottis. Called also electrolarynx.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lar·ynx

, pl.

la·ryn·ges

(lar'ingks, lă-rin'jēz), Avoid the misspelling/mispronunciation larnyx.
The organ of voice production; the part of the respiratory tract between the pharynx and the trachea; it consists of a framework of cartilages and elastic membranes housing the vocal folds and the muscles that control the position and tension of these elements.
[Mod. L. fr. G.]
Farlex Partner Medical Dictionary © Farlex 2012

larynx

(lăr′ĭngks)
n. pl. larynges (lə-rĭn′jēz) or larynxes
The part of the respiratory tract between the pharynx and the trachea, having walls of cartilage and muscle and containing the vocal cords enveloped in folds of mucous membrane.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

larynx

The region of the throat between the pharynx (tip of the epiglottis) and trachea (cricoid cartilage) which contains the vocal cords and is involved in breathing, swallowing, and speech.

Boundaries
• Superolateral boundary—Tip of the epiglottis and aryepiglottic folds.
• Inferior limit—Inferior rim of the cricoid cartilage.
• Posterior limit—Posterior mucosa covering cricoid cartilage, arytenoid region, and interarytenoid space.
• Anterior limit—Lingual surface of epiglottis, thyrohyoid membrane, anterior commissure, thyroid cartilage, cricothyroid membrane, and anterior arch of the cricoid cartilage.

Regions
Supraglottis, glottis, subglottis.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

lar·ynx

, pl. larynges (laringks, lă-rinjēz) [TA]
The organ of voice production, which also serves a protective function for the airway; the part of the respiratory tract between the pharynx and the trachea: it consists of a framework of cartilages and elastic membranes housing the vocal folds and the muscles that control the position and tension of these elements.
[Mod. L. fr. G.]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

larynx

(lar'inks) plural.larynges [Gr.]
Enlarge picture
LARYNX
A tube built of cartilage that begins at the pharynx and that forms the initial segment of the respiratory tree, extending from the base of the tongue to the trachea. Its closing mechanisms prevent the aspiration of liquids and solids during swallowing and allow coughing and the production of vocalizations. See: illustration

Anatomy

The framework of the larynx is built of three single cartilages and three paired cartilages. The unpaired cartilages are: the cricoid cartilage, a thick cartilage ring on top of the trachea; the thyroid cartilage, a V-shaped cartilage that sits on the cricoid with the point of its 'V' facing forward; and above this, the epiglottic cartilage, shaped like an upright paddle, with its handle held inside the front angle of the thyroid cartilage. The three smaller paired cartilages are: the arytenoids, the corniculates, and the cuneiforms. These nine cartilages are held together by membranes and ligaments, usually named by the structures that are interconnected; for example, the cricothyroid membrane connects the front of the cricoid cartilage with the base of the thyroid cartilage in the midline.

The intrinsic muscles of the larynx -- cricothyroid, posterior cricoarytenoid, lateral cricoarytenoid, thyroarytenoid, transverse and oblique arytenoids, and vocalis -- alter the length and tension of the vocal cords and the size and shape of the opening between them (the rima glottis). The vagus nerve supplies motor and sensory innervation to the larynx; the cricothyroid muscle is innervated by the external laryngeal branch of the vagus, while the other intrinsic muscles are innervated by the recurrent laryngeal branch of the vagus.

The cavity within the larynx comprises three consecutive chambers. The first chamber, the vestibule of the larynx, is a tube between the pharynx and a pair of folds, the vestibular folds (the "false vocal cords"), that protrude into the larynx. The second chamber, the ventricle of the larynx, is a short segment between the vestibular folds and the vocal folds; the ventricle has lateral recesses extending laterally under the vestibular folds. The third chamber, the infraglottic cavity (infraglottic larynx, subglottic space), is a tube between the vocal folds and the trachea.

foreign bodies in larynx

An inhaled or aspirated solid object, such as a piece of meat, hard candy, safety pin, or coin, in the larynx. Any aspirated object poses an imminent risk of airway obstruction.

Symptoms

Symptoms may include coughing, choking, dyspnea, fixed pain, or loss of voice.

Patient care

If the patient is able to speak or cough, the rescuer should not interfere with the patient's attempts to expel the object. If the patient is unable to speak, cough, or breathe, the rescuer should apply the Heimlich maneuver 6 to 10 times rapidly in succession. Using air already in the lungs, the thrusts create an artificial cough to propel the obstructing object out of the airway. If the patient loses consciousness, carefully assist him or her to the ground in a supine (face up) position. Next the rescuer should begin CPR since compressions have been shown to be effective in clearing an obstruction. With each time attempt to ventilate, the rescuer should first look in the mouth to see if there is an object that can be pulled out of the airway with gloved fingers. Previously chest thrusts were taught for an obese or pregnant patient or a child with a foreign body airway obstruction. To simplify this procedure the Emergency Cardiac Care Guidelines 2005 recommend all patients receive chest compressions following CPR. For an infant, the rescuer uses back slaps before chest thrusts. Direct laryngoscopy and the use of Magill forceps may be required to remove a foreign object. If the object cannot be readily removed with these measures, an emergency cricothyrotomy, or emergency tracheotomy may be required. See: Heimlich maneuver

Medical Dictionary, © 2009 Farlex and Partners

larynx

The ‘Adam's apple’ or voice box. The larynx is situated at the upper end of the wind-pipe (TRACHEA), just in front of the start of the gullet (OESOPHAGUS). At its inlet is a leaf-shaped flap of cartilage, the EPIGLOTTIS, that prevents entry of swallowed food. It has walls of cartilage and is lined with a moist mucous membrane and contains the vocal cords. These are two folds of the mucous membrane that can be tensed by tiny muscles to control their rate of vibration as air passes through them, and hence the pitch of the voice. The gap between the folds is called the glottis.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

larynx

a dilation of the upper part of the TRACHEA of TETRAPODS (Adam's apple in humans), occurring in the front part of the neck. It is triangular in shape (base uppermost) and is made up of 9 cartilages moved by muscles. It contains the vocal cords which are elastic ligaments embedded in two folds of mucous membrane.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Larynx

Also known as the voice box, the larynx is composed of cartilage that contains the apparatus for voice production. This includes the vocal cords and the muscles and ligaments that move the cords.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

lar·ynx

, pl. larynges (laringks, lă-rinjēz) [TA]
Organ of voice production; part of respiratory tract between pharynx and trachea.
[Mod. L. fr. G.]
Medical Dictionary for the Dental Professions © Farlex 2012
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