Authors : Yogesh V. Bhute and Vidya V. Baile
Page Nos : 97-109
Description :
Neuropeptide-Y (NPY), a 36 amino peptide was examined within the olfactory area, forebrain and pituitary within the grown-up Indian major carp Labeo rohita, using immunocytochemical technique. Within the olfactory bulb, NPY positive fibers were dispersed within the olfactory nerve layer, mitral cell layer, granular cell layer and NPY positive response was observed within the mitral cells as well as within the nervous terminalis (NT) which extended within the medial olfactory tract (MOT). NPY positive cells were localized within the MOT. Within the telencephalon, multipolar NPY positive cells were found within the nucleus entopeduncularis (NE). Within the optic chiasma, both cells and filaments were disseminated. Nucleus preopticus (NPO) and nucleus lateralis tuberis (NLT) both were innervated by NPY positive fibers. CSF reaching NPY positive cells were too oserved within the nucleus hypothalamicus medialis (Nhm). Within the epithalamic area, habenular ganglion had NPY positive cells. Within the pituitary organ, NPY positive fibers innervated the neurohypophysis and proximal pars distalis (PPD). These discoveries in L. rohita proposed that NPY might play a part of neurotransmitter within the olfactory receptor neurons that transmit the data to the olfactory bulb. NPY positive response found within the MOT proposes that it might carry signals to the telencephalon and other ranges within the brain. Localization of NPY positive fibers within the neurohypophysis and PPD which has gonadotropin discharging cells show coordinate association of NPY in the process of reproduction, probably regulating spawning activity in the males of L. rohita.
