Fig. 9.4. Neuropil in layer 2 of the primary visual cortex of a 25 year old monkey. In the middle of the field is a transversely sectioned dendritic shaft that is forming synapses with three axon terminals. One of the terminals contains pleomorphic synaptic vesicles and is forming a symmetric synapse with the dendrite. The other two axon terminals contain round, larger synaptic vesicles and are forming asymmetric synaptic junctions with the dendrite.
