ENT Students Larynx Anatomy
5Laryngeal cartilages
The larynx is formed of the following cartilages:
1-Thyroid cartilage:


2-Cricoid cartilage:


3-Epiglottis.


4-Arytenoid cartilages

10Laryngeal membranes and ligamentts
They are:
1-Thyrohyoid membrane.



2-Cricothyroid membrane.

3-Cricotracheal ligament.

4-Thyro-epiglottic ligament.
5-Hyo-epiglottic ligament.
6-Three glosso-epiglottic ligaments (1 median-2 lateral).

7-Conus elasticus.

8-Quadrangular membrane.

20Laryngeal spaces & folds
A-Laryngeal spaces:
1-Pre-epiglottic space.

2-Para-glottic space.

B-Laryngeal folds:
1-True vocal folds.
2-False vocal folds.
3-Ary-epiglottic folds.
4-Glosso-epiglottic folds.
25Laryngeal muscles
Laryngeal muscles are:
1-LCA (lateral crico-arytenoid).
2-PCA (posterior crico-arytenoid).
3-CT (crico-thyroid).
4-IA (inter-arytenoid).
5-AE (ary-epiglotticus).
6-TA (thyro-arytenoid=vocalis).

All muscles are supplied by the recurrent laryngeal nerve (RLN) except the crico-thyroid (CT) which is supplied by the superior laryngeal nerve (SLN).



Function of the muscles:
A-Abductors: PCA (only one).
B-Adductors: LCA, CT, IA, AE.
C-Tensors: TA, CT.
D-Laryngeal inlet: AE

30Nerve supply of the larynx
The vagus nerve supplies the larynx by motor and sensory supply through:



1-Superior laryngeal nerve (external and internal branches).
2-Recurrent laryngeal nerve.


40Blood supply
The larynx receives blood supply from:
1-Superior laryngeal artery (a branch from the superior thyroid artery).
2-Inferior laryngeal artery (a branch from the inferior thyroid artery from the thyrocervical trunk).


50Normal endoscopic anatomy
The normal endoscopic anatomy of the larynx:



60Function of the larynx

Function of the larynx:
1-The voice box.
2-Air passage.
3-Protection of the airway.
4-Help in raising the intra-abdominal pressure in straining.