LARYNGEAL CAVITY

Laryngeal cavity
- extent
  - inlet of larynx to lower border of cricoid cartilage
- inlet of larynx
  - placed obliquely
  - bounded
    - anteriorly
      - epiglottis
    - posteriorly
      - interarytenoid fold of mucous membrane
    - each side
      - aryepiglottic fold
- mucous membrane
  - folds
    - upper fold
      - vestibular fold
        
        space between two folds is
        
        rima vestibuli
    - lower fold
      - vocal fold
        
        space between two folds is
        
        rima glottidis
        
        limited posteriorly by
        
        interarytenoid fold
      - attached
        
        anteriorly
        
        middle of angle of thyroid cartilage on its posterior aspect
        
        posteriorly
        
        vocal process of arytenoid cartilage
  - folds divide the cavity in to 3 parts
    - above vestibular fold
      - vestibule of larynx or supraglottis
    - between vestibular fold and vocal folds
      - sinus or ventricle of larynx ( sinus of morgagni )
        
        anterior part is prolonged upwards as a diverticulum
        
        between vestibular fold and lamina of thyroid cartilage
        
        saccule of larynx
        
        oil can of larynx
        
        helps in lubrication of vocal folds
    - below vocal folds
      - infraglottis