The olfactory receptor organs and their primary centers are classified into several types. The receptor organs are divided into fish-type olfactory epithelium (OE), mammal-type OE, middle chamber epithelium (MCE), lower chamber epithelium (LCE), recess epithelium, septal olfactory organ of Masera (SO), mammal-type vomeronasal organ (VNO) and snake-type VNO. The fish-type OE is observed in flatf...

The olfactory epithelium of Scatophagus argus (Linnaeus) was investigated by light and scanning electron microscopy. The elongated olfactory organ is made up of 20 to 22 primary lamellae arranged on both sides of the narrow median raphe. Sensory and non-sensory regions are located separately on each lamella. The sensory epithelium occupies the upper apical broad half and extreme basal part of t...

The aim of this study is to determine the morphology of the vomeronasal organ in Angora goats (Capra hircus). The heads of eight adult Angora goats (Capra hircus) obtained from the slaughterhouse were used as materials. Six heads with vomeronasal organ were examined by macro and micro dissections, the others were removed from the longitudinal ridge of mucosa in the ventral portion of the nasal ...

In order to study the olfactory discriminating ability of lacustrine sockeye salmon (Oncorhynchus nerka) and masu salmon (O. masou), the integrated olfactory nerve response to various freshwaters was recorded by electrophysiological techniques. In both species independent of sex and gonadal maturity, each freshwater caused a different olfactory response. Source and effluent waters of the cultur...

It is now known that removal of the olfactory bulbs increases basal gonadotropin secretion and prevents short-photoperiod-induced testicular regression in Syrian hamsters. The experiments described in the present paper were an attempt to determine which neuronal systems associated with the olfactory bulbs are responsible for this influence on the reproductive neuroendocrine axis. In the first e...

Olfactory mucosa was excised from the heads of embryonic day 15 (E15) rat fetuses, prior to the appearance of olfactory marker protein (OMP), and cultured with or without the presumptive olfactory bulb. Specific immunohistochemical staining for the OMP was detected in both groups of explants 6 days after explantation. At no time do the supporting cells and basal cells show positive OMP staining...

Following unilateral olfactory bulbectomy in rats the ipsilateral olfactory neuroepithelium undergoes degeneration. Subsequently, the receptor neuron complement of the tissue is restored by the proliferation and differentiation of immature neuroblasts. However, as noted by other workers, in the absence of a target organ the dynamics of neuron regeneration is altered such that there is an overal...

Odorant cues are recognized by receptors expressed on olfactory sensory neurons, the primary sensory neurons of the olfactory epithelium. Odorant receptors typically obey the "one receptor, one neuron" rule, in which the receptive field of the olfactory neuron is determined by the singular odorant receptor that it expresses. Odor-evoked receptor activity across the population of olfactory neuro...

Pheromone detection by the vomeronasal organ (VNO) is thought to rely on activation of specific receptors from the V1R and V2R gene families, but the central representation of pheromone receptor activation remains poorly understood. We generated transgenic mouse lines in which projections from multiple populations of VNO neurons, each expressing a distinct V1R, are differentially labeled with f...