Authors : Yogesh. V. Bhute
Page Nos : 56-69
Kluver and Barrera and Aldehyde fuchsin histochemical methods were used to study neuroanatomy of the olfactory organ, forebrain and pituitary gland in the major carp Catla catla. Organization of olfactory system in the C. catla, divided into sensory and nonsensory components. The sensory component consists of large number of olfactory receptor neurons (ORNs) that release axons forming over the olfactory nerve. The olfactory nerve fibers penetrate the bulb, spread along the periphery and possibly make synaptic contacts with the dendrites of the mitral cells. The olfactory bulb is divided into four layers, outer layer is olfactory nerve layer (ONL), below ONL, Glomerular layer (GL) is present. Olfactory bulb was connected to the forebrain by the medial olfactory tract (MOT) and the lateral olfactory tract (LOT). Forebrain was divided into telencephalon and diencephalon. In the telencephalon, larger size neurons forming a cluster adjacent to the lateral forebrain bundle (LFB) i.e. nucleus entopeduncularis (NE). Diencephalon was divided into preoptic area, hypothalamus, thalamus and epithalamus. In the Preoptic area, Nucleus preopticus (NPO) was divded in to Nucleus preopticus pars parvocellularis (NPOp) and pars magnocellularis (NPOm) were AF-positive. On the ventro-lateral side of the horizontal commissure (HC) in the preoptic area, nucleus of HC was localized. In the hypothalamus, behind the HC, tuberal area starts. In tuberal area, nucleus hypothalamicus (Nh), nucleus lateralis tuberis (NLT), nucleus recesses lateralis (NRL) and nucleus inferior lobi (NIL) prominently observed. Above hypothalamus, thalamus shows thalamic nuclei. Epithalamus show paired habenular ganglia over thalamus. Pituitary gland shows pars intermedia (PI), proximal pars distalis (PPD) and rostral pars distalis (RPD).