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Flashcards in Histology Deck (12):
1

What tissue lines the initial part of the nasal cavity?

Keratinised stratified squamous epithelium

2

What lines the deeper part of the nasal cavity?

Initially, keratin is lost
Deeper, it changes to respiratory epithelium

3

What is respiratory epithelium?

Pseudostratified ciliated columnar epithelium with goblet cells

4

What layer is underneath the respiratory epithelium?

Lamina propria - connective tissue

5

What is contained within the lamina propria?

Seromucous glands
Rich venous plexus which can quickly engorge with blood to 'block' the nose

6

What happens to the cartilidge 'C's that surround the trachea as you go further down the respiratory tree?

Change to irregular cartilidge discs in the bronchi
Cartilidge becomes more and more sparse
No longer present in bronchioles and alveoli

7

What does the lamina propria of the bronchioles consist of?

Smooth muscle, elastic and collagenous fibres

8

What are the terminal bronchioles lined with?

Cuboidal ciliated epithelium and contain non-ciliated Clara cells

9

What are the roles of Clara cells?

Stem cells
Detoxification
Immune modulation
Surfactant production

10

What is the low cuboidal epithelium of the terminal bronchioles replaced with in the alveoli?

Discontinuous squamous type 1 alveolar cells

11

What are type 1 alveolar cells?

Simple squamous epithelium that lines the alveolar surfaces covering over 90% of the alveolar surface
These cells provide a barrier of minimal thickness that is permeable to gases

12

What are type 2 alveolar cells?

Release surfactant which covers the epithelial lining of the alveoli