A neuron has three main parts — a soma, dendrites and axon (top illustration) — to send and receive signals to other cells in a neuronal network, in a human brain (bottom illustration).

An example Sst Chordl cell (left) shows dense projections to cortical layer 6, while another inhibitory subtype, Sst Hpse Cbln4 (right), shows dense projections to layer 4.