Histology 2016-2017 Department of Anatomy &Histology



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Histology 2016-2017

Department of Anatomy &Histology: Dr.Rajaa Ali

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Respiratory System I

Chapter Outline:

Overview of Respiratory System:

Nasal Cavity:

  • Vestibule of the Nasal Cavity.

  • Respiratory Region of the Nasal Cavity .

  • Olfactory Region of the Nasal Cavity .

  • Paranasal Sinuses .

Pharynx.

Larynx.

Trachea .

  • Mucosa.

  • Submucosa.

  • Fibrocartiligenous coat.

  • Advantitia.

Bronchi.

Bronchioles.

Bronchiolar Structure .

Aleveoli. .

Blood Supply .

Lymphatic Vessels .

Nerves .

Pleura


Learning Objectives:

After studying this chapter, you should be

able to:


  • Locate and describe the organs of the respiratory system.

  • Describe the functions of the respiratory structures.

Overveiw of Respiratory System: ( fig. 1)

● T e structures which are responsible for the inhalation of air, exchange of gases between the air and blood and exhalation of carbon dioxide constitute the respiratory system.

● Apart from respiration, this system is also responsible for olfaction and sound production.

● The respiratory system consists of two parts—a conducting part (which carries air) and a respiratory part (where gas exchange takes place).



● The conducting part consists of nasal cavity, paranasal sinuses, nasopharynx, larynx, trachea, bronchi, bronchioles and terminal bronchioles .

● The respiratory part consists of respiratory bronchioles, alveolar ducts, alveolar sacs and alveoli.
Fig. 1

GENERAL STRUCTURE OF THE CONDUCTING PORTION OF THE RESPIRATORY TRACT

In general, the respiratory tract is made of four coats (Fig. ), namely:



1. Mucosa

It includes the epithelial lining and the underlying lamina propria. The epithelium is usually pseudostratified ciliated columnar epithelium with goblet cells.


2. Submucosa

It is a layer of loose connective tissue containing mixed glands.



3. Cartilage layer

This layer is mostly formed by hyaline cartilage plus smooth muscle.



4. Adventitia

It is a layer of fibroelastic connective tissue merging with the surrounding tissue.