S 1.4 Flashcards
- This is a mucous membrane that is highly specialized for smell.
- It is found in the roof of the nasal cavity, superior concha, and upper part of the nasal septum; its total surface area is about 50 mm2.
- It is lined by olfactory epithelium—an unusually thick (75-100 µm high) pseudostratified epithelium—that consists of three cell types: olfactory cells, sustentacular (supporting) cells, and basal cells.
NOSE: Olfactory Mucosa
NOSE: Olfactory Mucosa: Olfactory epithelium: What are the three cell types?
- olfactory cells
- sustentacular (supporting) cells
- basal cells
NOSE: Olfactory Mucosa: Olfactory epithelium: What cell type?
- slender bipolar neurons spanning the width of the epithelium, are receptor cells that bind odoriferous substances and convert them to nerve impulses.
- They are the only neurons in the body with direct exposure to a body surface.
- The apical dendrite of each cell ends as a bulbous olfactory knob, which extends above the epithelial surface. The dendrite leads to a nucleated cell body, in middle to deep regions of the epithelium.
Olfactory cells
NOSE: Olfactory Mucosa:
In the _______ ________ , the unmyelinated axon converges with others to form nerve fascicles. They course through the cribriform plate of the ethmoid bone to end in the olfactory bulb.
lamina propria
NOSE: Olfactory Mucosa: Olfactory epithelium: What cell type?
The other spherical nuclei in the epithelium belong to ________ _______; they often have pigment and stubby apical microvilli, which make the surface look striated
supporting cells
NOSE: Olfactory Mucosa: Olfactory epithelium: What cell type?
One row of small rounded nuclei next to the ill-defined basement membrane is of ________ ________
basal cells
NOSE: Olfactory Mucosa:
The ___________ __________ is loose, highly vascular connective tissue containing many thin-walled blood vessels and branched tubuloalveolar glands (of Bowman), which take serous secretions via ducts to the mucous membrane surface.
lamina propria
