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Microanatomy of the Respiratory System (lower: below the larynx…
Microanatomy of the Respiratory System
upper
: above the larynx
Nasal cavity
olfactory segment
epithelium:
pseudostratified columnar
other cells
olfactory neurons
bipolar neurons = 1 axon and 1 dendrite
non-motile
cilia = chemoreceptor
supporting cells (sustentacular)
columnar
basal cells
stem cells for both olfactory neurons and supporting cells
respiratory segment
epithelium: simple ciliated columnar
other cells
goblet cells
brush cells (chemosensory receptors)
small granule cells (neuroendocrine system)
basal cells
lower
: below the larynx
conducting zone
primary bronchus
secondary bronchus
tertiary bronchus
bronchioles
terminal bronchioles
trachea
respiratory zone
respiratory bronchioles
alveolar ducts
alveolar sacs
alveolus