No. 9. 1. Introduction of the Respiratory System 2. The nose 3. The pharynx 4. The larynx. Chapter 3 The Respiratory System. Introduction.
1. Introduction of the Respiratory System
2. The nose
3. The pharynx
4. The larynx
Constitution and morphology of the proper nasal cavity:
Each cavity has a roof, a floor, a medial wall and a lateral wall.
① The roof is formed by the nasal bone, cribriform plate of the ethmoid bone.
② The floor is formed by the upper surface of the hard palate in front (2/3) and the soft palate behind (1/3).
③ The medial wall is the nasal septum.
Beneath the shelves formed by the conchae are recesses called the superior, middle, and inferior meatuses.
Sphenoethmoidal recess: above and behind the superior nasal concha there is the sphenoethmoidal recess.
The inferior nasal meatus receives the termination of the nasolacrimal duct.
The middle and superior meatuses and sphenoethmoidal recess receive the openings of paranasal sinuses.
It divided into two regions:
In the bones around the nasal cavity there are some air spaces called paranasal sinuses, they are:
All these sinuses communicate with the nasal cavity and are lined by mucous membrane which is continuous with that of the nasal cavity. So the infection of nasal cavity may spread to the paranasal sinuses, resulting in sinusitis.
Ⅰ) The Cricothyroid Joint
Ⅰ) The Thyrohyoid Membrane
Ⅱ) The Conus Elasticus
Ⅲ) The Quadrangular Membranes
Ⅰ) Morphology of lateral wall of the laryngeal cavity:
1.Vestibular folds and vocal folds:
The laryngeal cavity is divided into three parts: