Hypothalamo-hypophysial vascularization of the teleost, Puntius sophore (Ham.) with special reference to its tetrapodan features

Abstract

In Puntis sophore a hypothalamo-hypophysical portal system structurally comparable to the tetrapods is present. Apart from this the teleostean type of neuroadeno-interface vasculature is also evident. The hypothalamic artery gives rise to the primary capillary plexus of the infundibular floow. The protal vessels formed from them largely irrigate the adenohypophysis through their secondary vascular network. The dense neurosecretory axonal ramifications present in the infundibular floor are in close morphological contact with the primary plexus. This region also exhibits intense monoamine oxidase activity. Thus, the infundibular floor of P. sophore is structually comparable to the meidan eminence of the higher vertebrates.