limbic system Flashcards
olfactory anatomy: recognise the anatomical basis of the olfactory system
how many different odours can the olfactory system detect
2000-4000
3 sections of olfactory epithelium
bipolar olfactory neurones, sustentacular cells, basal cells
olfactory system pathway
olfactory epithelium (at top of nose) -> bipolar olfactory neurones -> through cribriform plate -> olfactory bulb -> project back to brain via olfactory tracts -> split into 2 striae (piriform complex in temporal lobe, other medially to orbitofrontal cortex)
where is olfactory bulb
within bipolar cells synapse with mitral cells in glomerular type formation
what are sustentacular cells
support cells, like glial cells
what are basal cells used for, and what happens to them with age
have potential for production of new cells in life, but progressive loss with age
what do olfactory connections to brainstem promote
autonomic responses e.g. smell food and salivate
what is anosmia
clinical deficit of smell
2 causes of anosmia
shear of olfatory neurones as they pass through cribriform plate, neurodegeneration with age
what are prodromal auras in epilepsy
where epileptics can sense an impending seizure because they smell something associated with that (much of epilepsy is temporal lobe based)
what can sometimes be smelt in Parkinson’s disease
abnormal protein accumulation
diagram of olfactory system
