Four types of neurons were distinguished in the septum of the guinea pig: 1. Piriform neurons (perikaryons 20-25 microns) with two thick dendritic trunks and an axon which emerges from the perikaryon on the opposite side to the dendritic trunks. These neurons are the main type of cells in the investigated nuclei; 2. Triangular neurons (24-32 microns) with three thick dendritic trunks arising conically from the perikaryons and a thin axon emerging directly from the soma; 3. Fusiform neurons (35-40 microns) which have two thick dendritic trunks on both poles of the cell body and a thin axon emerging from the soma; 4. Multipolar neurons (30-35 microns) with 4-5 thick dendritic trunks which emerge conically from the perikaryon. The axon arises near one of the dendritic trunks.
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