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Olfactory System: Pathway

NEUROPHYSIOLOGY

I} Efferent fibers

Granule celi (cxcited by and inhibiting to mitral and tufted cells)

Fibors from contralateral olfactory bulb

Fibors to contralatoral olfactory bulb

Anterior commissure

Medial olfactory stria

Olfactory trigone and olfactory tuberde

Antorior porloratod substance

Latcral olfactory stria

-    Mitral celi

-    Recurrent process

Olfactory epithelium Olfactory nerves

Olfactory bulb Cribriform piąte of ethmoid bonę

Entorhinal arca

olfactory' tract nucleus

Piriform lobe

Uncus

FiGURt 2.41 Olfactory Pathway

Olfactory stimuli are delccted by the nervc fibers of the olfactory epithelium and conveyed to the olfactory bulb (detailed local cir-cuitry shown in upper lott panel). Integrated signals pass along the olfactory tract and centrally diverge to pass to the anterior commis-sure (some eflerenl projcctions coursc to the contralatoral olfactory bulb. blue lines) or terminate in the ipsilateral olfactory trigone (olfactory tuberde). Axons thcn project to the primary olfactory cortex (piriform cortexj, entorhinal cortex, and amygdala.

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