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Flashcards in Histology Deck (18):

From the inside out, what is the general layout of hollow organs?

Mucosa (Epithelium, Lamina propria, muscularis mucosa), submucosa (glands), muscularis externa, Adventitia


____ epithelium line the body cavities that open to outside.



What are the two distinct epithelial regions in the nasal cavity?**

olfactory and respiratory


How does the nasal cavity modify incoming air?**

1. Concha increase filtration and surface area by increasing the number of eddies, which are circular air movement.
2. warms, moisten, filters,
3. Vestibule mucus traps particles


What kind of cells are present in the respiratory region?

PSCC, basal cells, brush cells, small granule cells, goblet cells, ciliated cells, basement membrane, lamina propria has lymphocytes, vessels, and glands


What kind of cells are present in the olfactory region?**

OC (bipolar neurons), SC (physical, metabolic support), BC (replace other cells)


Describe the lamina propria in the olfactory region and in the respiratory region?

O: bowman's glands, nerve fibers, attach to bone
R: lymphocytes, blood vessels, glands, attach to bone


Type of cell in nasopharynx

PSCC with goblet cells


Type of cell in oropharynx

stratified squamous, non-keratinized


Cell lining the larynx

PSCC with goblet cells EXCEPT over vocal folds-- stratified non-keratinized squamous


What are the layers of the trachea?

mucosa (PSCC, lamina propria, bm, lymphocytes, no muscularis), submucosa, cartilage (hyaline), adventitia


How do bronchi walls change once they are intrapulmonary?

the cartilage rings become cartilage plates. Additional muscularis mucosa appears in the muscosal layer: PSCC-- LP--BM--MM--subM--cartilage plates


Describe the layers/histology of bronchioles and terminal bronchioles from inside out

1. muscosa: mainly PSCC, some simple columnar and cuboidal, no goblets
2. Non-PSCC cells have clara cells that secrete CC16 and suface active agent
3. increast muscularis mucosa to regulate resistance to flow
4. no submucosa, goblets, or glands


What kind of cells are seen in respiratory bronchioles?

ciliated cuboidal cells and clara cells proximally, clara cells distally


What type of cells make up alveolar epithelium?

Type 1 alveolar epithelium. Thin squamous cells where gas exchange occurs
Type 2 alveolar epithelium. Thin cuboidal cells that secrete surfactant and regenerate type 2 and type 1


Describe the difference between thick and thin regions of alveoli

thick contains fibros and macs. Thin has surfactant, type 1 cells and type fused basal laminas of type 1 epi and capillary endo.


What are alveolar pores of kohn?

allows air to pass between alveoli in case of non ventilating or non perfused alveoli


Where are alveolar macrophages found?

in the thick part of the septum or alveoli