Respiratory Histology

Question 1

Describe the histology of the 3 main regions of the nasal cavity

Answer 1

Vestibule - strat squam kerat. Sebaceous and sweat glands

Respiratory region - pseudostrat ciliated columnar with goblet cells

Olfactory - pseudostrat ciliated columnar with bowmans (olfactory) glands.
1. Olfactory cells - bipolar ciliated neuron
2. Sustentacular - supporting cell with microvilli
3. Basal stem cells
NOTE: no goblet cells

Question 2

Describe histology of the larynx

Answer 2

Most of larynx lined by resp epithelium except

1. True vocal cords = strat squam non-kerat
2. Superior epiglottis = strat squam non-kerat

Vocal ligament = dense regular CT
Vocalis m. = skeletal muscle

Question 3

Along the respiratory tree describe changes in

1. Epithelium
2. Hyaline cartilage
3. Sm muscle
4. Ciliated cells
5. Goblet cells
6. Glands

Answer 3

Epithelium - pseudostrat, simple columnar, cuboidal (bronchioles), alveolar: 1 + 2
Hyaline cartilage - rings to irregular plates, none in bronchioles
Smooth muscle - no prominent sm muscle in bronchioles
Clara cells -