Respiratory Histology

Front 1

conducting portion

Back 1

- airways that deliver air to the lungs
- warm, moisten and filter air
1) nose
2) nasopharynx
3) larynx
4) trachea
5) bronchi
6) bronchi
7) bronchioles
8) terminal bronchioles

Front 2

respiratory portion

Back 2

location within the lung where O2 in inspired air is exchanged for CO2 in blood.

Front 3

nares

Back 3

- nostrils
- outer portions lined by thin skin

Front 4

vestibule

Back 4

- epithelium becomes non-keratinized
- posteriorly lining changes to respiratory epithelium
- pseudostratified columnar epithelium with goblet cells
- vibrissae ( thick short hairs) filter large particles form inspired air
- vascular lamina propria with seromucous glands

Front 5

olfactory epithelium

Back 5

- roof of nasal cavity, on either side of nasal septum on superior nasal conchae
- tall pseudostrtified columnar epithelium
- olfactory cells
- sustentacular cells
- basal cells
- lamina propia: veins, unmyelinated nerves, bowman glands

Front 6

olfactory cells

Back 6

- bipolar nerve cells with bulbous apical projection (olfactory vesicle) with extensions of modified cilia

Front 7

olfactory cilia (olfactory hairs)

Back 7

- long non-motile cilia extend over the surface of the olfactory epithelium
- proximal 1/3: 9 + 2 axoneme pattern
- distal 2/3 = 9 perpheral singlet mt srrounding a central pr. of mt
- odor receptors

Front 8

Supporting (sustentacular) cells

Back 8

- most apically located nuclei of the 3 cell types
- microvilli and prominent terminal web of filaments

Front 9

basal cells

Back 9

- rest on basal lamina do not extend to the surface
- from an incomplete layer of cells
- regenerative for all 3 cell types

Front 10

Bowman's glands

Back 10

- thin watery secretion
- odorous substances dissolve
- flushes epithelial surface

Front 11

nasopharynx

Back 11

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