Cavitas laryngis

At each side there is a pouch -

ventriculus laryngis which acts as the resonator.

Cavitas infraglottica extends from plicae vocales to the next organ - trachea. There is conus elasticus below the mucous membrane in

cavitas infraglottica.

Aditus laryngis is bordered by the following structures:

epiglottis, plicae aryepiglotticae, incisura interarytenoidea.

The mucous membrane covers lig. vestibulare and forms

plica vestibularis

The mucous membrane also covers lig. vocale and forms the vocal fold -

plica vocalis

The fold is concerned in the production of the sound. M. vocalis lies parallel to the ligament in the vocal fold. The narrow triangular fissure between both plicae vocales is

rima glottidis s. vocalis

There is a narrow fissure between both plicae vestibulares -

rima vestibuli

Cavitas laryngis extends from the laryngeal entrance to the lower border of the cricoid cartilage where it continues into the

trachea.

Rima glottidis has two parts:

1. pars intermembranacea - between plicae vocales, 2. pars intercartilaginea - between medial surfaces of the arytenoid cartilages.

The cavitas laryngis has hour-glass shape. There are three portions in the laryngeal cavity:

1. vestibulum laryngis, 2. glottis, 3. cavitas infraglottica

Vestibulum laryngis is the upper part and it extends from the entrance of the larynx -

aditus laryngis to plicae vestibulares

... is between plicae vestibulares and plicae vocales

glottis

here is .... which lies below the mucous membrane in vestibulum laryngis

membrana quadrangularis