extra parts Flashcards
What are the names of the 4 layers of the walls of the respiratory system ?
Mucosa
Submucosa
Cartilage or muscle
Adventitia
What is the mucous layer ?
Epithelium with supporting lamina propria under it
Contains goblets cells and cillia cells
What kind of tissue is a lamina propria ?
Connective
What is the submucosa?
Contains seromucous glands which have ducts that open into he mucous layer and release mucous and serous fluids
What is the adventitia ?
A fibrous connective tissue layer
What happens to the walls as your move further down the broncho tree?
- Less cartilage and more smooth muscle instead
- Smaller lumen
- Thinner walls
- Pseudoatrophy columnar epithelium to simple columnar epithelium
Describe the walls of the trachea
Wide flexible tube
Mucous is made up of ciliated pseudostratified columnar epithelium which contains goblet cells which secret mucous.
Lamina propria
Layer of elastic fibres
Submucosa layer contains seromucous gland which have watery secretions which moisten the airways.
There are C shaped rings of cartilage (20 of them) the gap of which is filled with the trachealis muscle and fibroelastic tissue.
The adventitia layer support and connects it to other structures.
What is the purpose of the rings of cartilage ?
Patency
What is the function of the mucous and submucosa layers in the trachea ?
Warm and moisten the air and trap particles
Describe the walls of the bronchi
Mucous is made up of ciliated pseudostratified columnar epithelium which contains goblet cells which release mucous.
lamina propria
Extra smooth muscle layer.
Submucous layer which does still contain some seromucous gland but not as many as the trachea.
Cartilage pates but not rings (decrease in size as you move down)
Adventitia
Describe the walls of the bronchioles
Mucous is made up of ciliated simple columnar epithelium (no cilia in terminal bronchioles) no goblet cells
Sub mucosa no seromucous glands,
Smooth Muscle but no cartilage
