<unk> s are neuroendocrine cells found in the medulla of the adrenal gland (suprarenal gland - located above the kidneys) and in other ganglia of the sympathetic nervous system. They are derived from the embryonic neural crest.
In the fifth week of (human) fetal development, neuroblast cells migrate from the neural crest to form the  sympathetic chain and preaortic ganglia. The cells migrate a second time to the adrenal medulla.<unk> s also settle near the sympathetic ganglia, vagus nerve, paraganglia, and carotid arteries. In lower concentrations, extra-adrenal<unk> s also reside in the bladder wall, prostate, and behind the liver.
Chromaffin cell
Immunoblast
Adipocyte
Granule cell
Melanocyte
Koilocyte
Neuroepithelial cell
Oocyte