Cavity of larynx
-
Upload
jinijazz93 -
Category
Education
-
view
166 -
download
1
Transcript of Cavity of larynx
![Page 1: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/1.jpg)
CAVITY OF THE LARYNX
ByJini Abraham
![Page 2: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/2.jpg)
Laryngeal cavity is lined by the respiratory epithelium except the vocal cords and parts of epiglottis, which is lined by the stratified squamous epithelium.
The cavity starts at the laryngeal inlet where it communicates with the pharynx and ends at the lower border of the cricoid cartilage where it continues with the lumen of trachea.
![Page 3: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/3.jpg)
![Page 4: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/4.jpg)
The laryngeal inlet is bounded –Anteriorly – free margin of epiglottisLaterally – Aryepiglottic foldPosteriorly – Interarytenoid fold
![Page 5: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/5.jpg)
Laryngeal interior is divided by two folds into three parts –
SupraglottisVestibuleVentricle
GlottisSubglottis
DIVISIONS
![Page 6: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/6.jpg)
Folds dividing the cavity are – Vestibular folds –
False vocal cordsTwo in numberEach is fold of mucous membrane extending anteroposteriorly across laryngeal cavity
Contains vestibular ligament, few fibres of thyroarytenoideus muscle and mucous glands
![Page 7: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/7.jpg)
Vocal folds – True vocal cordsTwo pearly-white shaped bands extending from the middle of thyroid angle to vocal processes of arytenoids
Each vocal cord consists of vocal ligament
![Page 8: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/8.jpg)
Mainly constitutes –
EpiglottisAryepiglottic
foldsArytenoidsFalse cords
SUPRAGLOTTIS
![Page 9: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/9.jpg)
Extends from laryngeal inlet to vestibular folds
Anterior wall formed by posterior surface of epiglottis
Sides by aryepiglottic foldsPosterior wall by mucous
membrane over anterior surface of arytenoids
VESTIBULE
![Page 10: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/10.jpg)
Sinus of larynxDeep elliptical space between
vestibular and vocal folds
VENTRICLE
![Page 11: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/11.jpg)
Diverticulum of mucous membrane which starts from the anterior part of ventricular cavity and extends upwards between vestibular folds and lamina of thyroid cartilage
Laryngocele – air containing sac present in the neck
Presence of mucous glands
SACCULE OF LARYNX
![Page 12: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/12.jpg)
Rima glottidisElongated space between vocal cords
anteriorly and vocal processes and arytenoids posteriorly
24mm in men and 16mm in womenNarrowest part of laryngeal cavityAnterior two-thirds formed by
membranous cords and posterior one-third by vocal processes of arytenoids
GLOTTIS
![Page 13: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/13.jpg)
Size and shape of glottis varies with movements of vocal cords
![Page 14: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/14.jpg)
Infraglottic larynxExtends from vocal cords to lower
border of cricoid cartilage
SUBGLOTTIS
![Page 15: Cavity of larynx](https://reader031.fdocuments.us/reader031/viewer/2022021814/58eca5f21a28ab2b218b463f/html5/thumbnails/15.jpg)
THANK YOU