Synapse ultrastructure of the initial axon segment of the pyramidal neuron.
D000818:Animals; D001369:Axons / Q000648:ultrastructure*; D002415:Cats; D002540:Cerebral Cortex / Q000648:ultrastructure*; D009044:Motor Cortex / Q000648:ultrastructure; D013003:Somatosensory Cortex / Q000648:ultrastructure; D013569:Synapses / Q000648:ultrastructure*