Olfactory system Flashcards
Primary sensory neuroepithelial receptor cells
located in olfactory mucosa of nasal cavity
their central processes terminate in olfactory bulb (olfactory glomeruli)
olfactory receptor cell, supporting cell, basal cell, brush cell
Mitral cell
principal type of neuron in olfactory bulb
directly contacted by processes of olfactory receptors
axons form efferent connections
Periglomerular and granule cells
interneurons in olfactory bulb
Tufted cell
sencond type of efferent neuron
axons join axons of mitral cell and go to olfactory tract
Olfactory trigone
olfactory tracts terminate here
in front of anterior perforated substance
Piriform cortex
formed by lateral olfactory area
primary olfactory cortical area
projects to:
MD nucleus of thalamus and hypothalamus via amygdala -> medial forebrain bundle -> orbitofrontal cortex
hippocampal formation via entorhinal cortex
Olfactory bulb
in cribriform plate of ethmoid bone layers: 1.nerve fiber layer 2. glomerular layer 3. external plexiform layer 4. mitral cell layer 5. internal plexiform layer 6. granule cell layer
Lateral olfactory stria
through insular limen
to: Piriform cortex: prepiriform area (br.51,34), enetorhinal are (br.28)
Medial olfactory stria
to septal nuclei, contralateral anterior olfactory nucleus and contralateral olfactory bulb
Intermediate olfactory stria
terminates at olfactory tubercle -> habenular trigone
Bowman’s olfactory glands
Tubuloalveolar serous secreting glands in mucosa
proteinaceous secretion
traps and dissolves odiferous substances for bipolar cells
constant flow allow old odors to be washed away
Centrifugal fibers
information from amygdala, neocortex, hippocampus, locus coeruleus, substansia nigra
functions in discriminating different odors, enhancing sensitivity for odor detection
