Published on November 27, 2016
1. Cavity of Larynx MOHAMED AKMAL KHAN MBBS (7TH SEM) IIMS&R, LUCKNOW
2. Index Introduction Inlet of larynx Vestibular folds Vocal folds Vestibule Ventricle Infraglottic Applied
3. Introduction Laryngeal cavity is a tubalar shaped cavity. It extends from the inlet of larynx to the lower border of cricoid cartilage Superiorly it opens into the anterior aspect of the pharynx just below and posterior to the tongue. Inferiorly it continues with trachea.
4. Inlet of larynx- Oblique opening Boundaries- Anterior- Epiglottis Posterior- Interarytenoid fold Sides- Aryepiglottic folds
5. Divided into three regions by 2 folds of mucous membrane on each side- 1. Vestibular folds 2. Vocal folds
6. Vestibular folds Two in numbers. Each is a fold of mucous membrane Extends anterioposteriorly across the laryngeal cavity. Contains vestibular ligament, few fibres of thyroarytenoideus muscle and mucous gland. Opening between the two fold is called Rima Vestibuli.
7. Vocal folds Also two in number Pearly white sharp band extending from the middle of thyroid angle to the vocal processes of arytenoids. Each consists of vocal ligament. Opening between the adjacent vocal folds is called Rima glottidis
8. Superior view of larynx through the laryngeal inlet as viewed by laryngoscope
9. Regions/Parts Divided into 3 parts- 1. Vestibule or Supraglottis 2. Ventricles 3. Infraglottic or Subglottic
10. Vestibule Lies between laryngeal inlet and vestibular fold (false cords) Boundaries:- Anterior- Posterior surface of epiglottis Posterior- Mucus memb. over anterior surface of arytenoids. Sides- By Aryepiglottic folds Posterior view of laryngeal cavity
11. Ventricle Lies between vestibular and vocal cords. The mucosa bulges on each side to produce an expanded trough-shaped cavity. Tubular extension of ventricle projecting anterosuperiorly b/w vestibular fold and thyroid cartilage is called Saccule. Posterior view of laryngeal cavity
12. Infraglottic Lies between vocal folds and inferior opening of larynx i.e lower border of cricoid cartilage.
13. Applied anatomy Singer’s nodule Large foreign body lodge in inlet. Small foreign body lodge in ventricle Laryngocele