The terminal axonal dilatation of a neurosecretory cell is found near a capillary (there is a red blood cell in the lumen). It contains numerous secretory granules whose contents are secreted by exocytosis into the blood stream through a system of fenestral diaphragms present in the endothelial lining #1, #2.

In addition to the secretory granules, the nerve ending cytoplasm shows small synaptic vesicles. It indicates a potential to conduct nerve impulses in the neurosecretory cells.