Ventral view of a sheep brain. The arrows indicates the lateral rhinal sulcus, which separates the phylogenetically older rhinencephalon from the newer portion of the cerebral hemisphere that is covered by neocortex. The rhinencephalon (nose brain) is concerned with olfaction and emotion. Identify the following three components of the rhinencephalon on the sheep brain shown on the right: olfactory bulb (O), piriform lobe (P), and lateral olfactory tract (t). The left olfactory bulb is cut open to reveal the lumen of the olfactory bulb.

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