کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2203498 1100502 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Morphological study on the olfactory systems of the snapping turtle, Chelydra serpentina
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Morphological study on the olfactory systems of the snapping turtle, Chelydra serpentina
چکیده انگلیسی


• The olfactory organ of the snapping turtle includes two types of sensory epithelia.
• One of them contains ciliated receptor neurons which send axons to the ventral OB.
• The other contains non-ciliated receptor neurons which send axons to the dorsal OB.
• G proteins were expressed similarly, but glycoconjugates were expressed differently.
• One might sense odors in the air, and the other might sense odors in the water.

In this study, the olfactory system of a semi-aquatic turtle, the snapping turtle, has been morphologically investigated by electron microscopy, immunohistochemistry, and lectin histochemistry. The nasal cavity of snapping turtle was divided into the upper and lower chambers, lined by the sensory epithelium containing ciliated and non-ciliated olfactory receptor neurons, respectively. Each neuron expressed both Gαolf, the α-subunit of G-proteins coupling to the odorant receptors, and Gαo, the α-subunit of G-proteins coupling to the type 2 vomeronasal receptors. The axons originating from the upper chamber epithelium projected to the ventral part of the olfactory bulb, while those from the lower chamber epithelium to the dorsal part of the olfactory bulb. Despite the identical expression of G-protein α-subunits in the olfactory receptor neurons, these two projections were clearly distinguished from each other by the differential expression of glycoconjugates. In conclusion, these data indicate the presence of two types of olfactory systems in the snapping turtle. Topographic arrangement of the upper and lower chambers and lack of the associated glands in the lower chamber epithelium suggest their possible involvement in the detection of odorants: upper chamber epithelium in the air and the lower chamber epithelium in the water.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tissue and Cell - Volume 48, Issue 3, June 2016, Pages 145–151
نویسندگان
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