Olfactory and Limbic System Flashcards
What does the main olfactory system detect?
Airborne Substances
What does the accessory olfactory system detect?
Fluid Phase Stimuli
What are the two ways molecules can enter nasal cavity?
Through nostrils when inhaling or through throat when chewing/swallowing
Why is olfactory epithelium unique?
Only area where neurons exposed to external environment
Only neurons capable of regeneration
First order neurons plug directly into primitive brain
Only neurons not routed through thalamus
What do olfactory nerve fibres synapse with?
Mitral and tufted cells of olfactory bulb
What separates peripheral and central olfactory systems?
Cribriform plate
What is difference between mitral and tufted cells?
Mitra cells have low firing rate and tufted cells have high firing rate
Where is primary olfactory cortex located?
Centered in uncus
Where do lateral striae send axons to?
Primary olfactory cortex
Where does medial striae carry afferent and efferent fibres to?
Across medial plane of anterior commissure where they meet nerve fibres from opposite side
What does olfactory cortex incorporate?
Piriform cortex, anygdala, entorhinal cortex and parahippocampal gyrus
What is fxn of olfactory tubercle?
Checks to ensure odour signal arose from actual odours
Regulates motor behaviours brought on my odours
What does amygdala process?
Pheromone, allomone and kairomone signals
What does hippocampus receive most of its olfactory information from?
Amygdala
What does parahipocampal gyrus house?
Topographical map for olfaction
