Primary olfactory cortex
Encyclopedia
The Primary olfactory cortex is a portion of the cortex
Cerebral cortex
The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different...

 involved in olfaction
Olfaction
Olfaction is the sense of smell. This sense is mediated by specialized sensory cells of the nasal cavity of vertebrates, and, by analogy, sensory cells of the antennae of invertebrates...

.

Some sources state that it includes the prepyriform area
Prepyriform area
Prepyriform area is a portion of the rhinencephalon consisting of paleocortex.Some sources state that it is part of the primary olfactory cortex....

 and entorhinal area.

Other sources state that it consists of the prepiriform cortex and periamygdaloid cortex
Periamygdaloid cortex
Periamygdaloid cortex is a portion of the rhinencephalon consisting of paleocortex.The periamygdaloid cortex plays a role in olfaction.It has been suggested that the left periamygdalar region may play a role in yawning....

.
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