Olfactory system Flashcards
what are the second order neurons of the olfcatory system
tuftal or mitral cells
what are the two main bundles of the olfcatory tract
the lateral olfactory stria and the medial olfactory stria
what is the lateral olfcatpry stria
carries the efferent projections of the olfactory bulb toward the primary olfactory cortex on the temporal lobe where conscious awareness/recognition of odour can be interpreted.
where is the olfactory association cortex
the anterior part of the parahippocampal gyrus or entorhinal area
whatis the function of the glomerulus
where synapses form between the terminals of the olfactory nerve and the dendrites of mitral, periglomerular and tufted cells.
what is the olfactory trigone
a triangular widening of the terminal olfactory tract.
where do olfcatory tract fibres travel
Fibres are deflected laterally in the lateral olfactory stria.
These fibers pass into the depths of the lateral fissure which they cross to reach the temporal lobe.
where is the glomerulus
olfcatory bulb
what are the two projection neurons
mitral and tufted cells
where do the axons of tuftal or mitral cells (second order neurons) terminate
terminate in the primary olfactory cortex of the uncus in the temporal lobe
what and where are the first order neurons of the olfactory system
olfactory receptor cells in the olfactory epithelium
why are olfcatory projections unique
consists of a sequence of only two neurons between the sensory receptors and cerebral cortex and does not project via the thalamus
what are the primary neurons of tye olfactory bulb
tuftal or mitral cells
what is the anterior commissure
connects the two halves of the olfactory system
where is the olfcatory bulb
the inferior surface of the frontal lobe.
what are the three cell types of juxtaglomerular cells
periglomerular (PG) cells, external tufted (ET) cells, and superficial short-axon (sSA) cells.
what is the intermediate stria and where does it terminate
. It is associated with reward behaviours
terminates in the intermediate olfactory area.
The axons of olfactory sensory neurons make synapses in the ________
glomerular layer
where are the somata of mitral cells
the mitral cell layer
what is the medial olfcaory stria
stria projects to the posterior part of the medial surface of the frontal lobe and is responsible for autonomic responses associated with olfaction
what is the pyriform cortex
The primary and association cortices
and are responsible for the appreciation of olfactory stimuli.
Neurons surrounding glomeruli in the Glomerular layer are called _________
juxtaglomerular cells (JG cells)
how do mitral and tufted cells work
Both mitral and tufted cells project a single primary dendrite into a single glomerulus, where they receive synaptic inputs from the axons of olfactory sensory neurons and make reciprocal synapses with the dendrites of periglomerular cells.
Secondary dendrites of mitral and tufted cells are elongated in the external plexiform layer (EPL), where reciprocal synapses are formed with granule cell dendrites.
where are the somata of tufted cells
are scattered throughout the external plexiform layer
what are granule cells
are axonless inhibitory interneurons extending dendrites apically into the Extrenal plexiform layer
