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Sex specific anatomical variation in the organization of Jacobson’s organ (VNO) with respect to its olfactory function in common worm snake Typhlina bramina

Kumari Ranjana*
P.G. Department of Zoology, B.N.Mandal University, Madhepura, Bihar, India
Received : 24th December, 2019 ; Revised : 25th February, 2020

Abstract : Jacobson’s organ also known as vomeronasal organ (VNO) has an important function in prey detection feeding and reproduction in the biological activities of worm snakes. In this article the anatomical and histological layout of this sensory organ in a worm snake Typhlina bramina has been reported. For this study, 5-7 micrometric histological sections were cut from their heads where the Jacobson’s organ remain located in the mid dorsal plain of the skull having the vomar and nasal plate flooring. The micrometric measurement of the organ lodged in the vomeronasal cranial capsule also laterally flanked by baso-medial side of nasal cavity. In this species of the worm snake (Typhlina
) the Jacobson’s organ has been found to possess an average linear length of 550 µm in male and 510 µm in female which is slightly smaller than other reported species. It has also a prominent connection to the nasal cavity along with a communicating tunnel with the oral cavity through 2 small apertures in the anterior palate. On close observation of the micro sections, the lachrymal duct descending from the eye (internal pocket) is also found to join the organ. Surprisingly the organs lumen since to be also lying by 2 different cellular layer likely to be sensory in function. Cellular
differentiation in the sensory epithelial layer which is relatively very thick has also been noticed and discussed in the paper. The central mushroom body covered by special epithelial layer has ciliated cells. Histochemically the epithelial cells have been found to be PAS positive due to heavy deposition of glycogen.

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