The urophysis and the caudal neurosecretory system of fishes.
D000717:Anatomy, Comparative; D000818:Animals; D005075:Biological Evolution; D004805:Ependyma; D005399:Fishes / Q000033:anatomy & histology* / Q000502:physiology; D006651:Histocytochemistry; D009416:Nerve Regeneration; D009489:Neurosecretion; D009995:Osmosis; D012621:Seasons; D013116:Spinal Cord / Q000033:anatomy & histology* / Q000098:blood supply / Q000166:cytology / Q000378:metabolism