The vomeronasal organ of the South American armadillo Chaetophractus villosus (Xenarthra, Mammalia): Anatomy, histology and ultrastructure

The vomeronasal organ (VNO) is a chemoreceptive structure that has not been extensively studied in the Xenarthran order. Tissue samples from the VNO of the armadillo Chaetophractus villosus were prepared for light and electron microscopy. The VNO is located in the anterior part of the base of the na...

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Autor principal: Carmanchahi, P.D
Otros Autores: Aldana Marcos, H.J, Ferrari, C.C, Affanni, J.M
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 1999
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030 |a JOANA 
100 1 |a Carmanchahi, P.D. 
245 1 4 |a The vomeronasal organ of the South American armadillo Chaetophractus villosus (Xenarthra, Mammalia): Anatomy, histology and ultrastructure 
260 |c 1999 
270 1 0 |m Carmanchahi, P.D.; Instituto de Neurociencia, FCEyN, Lab. 102, (1428) Buenos Aires, Argentina; email: pdc@bg.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a The vomeronasal organ (VNO) is a chemoreceptive structure that has not been extensively studied in the Xenarthran order. Tissue samples from the VNO of the armadillo Chaetophractus villosus were prepared for light and electron microscopy. The VNO is located in the anterior part of the base of the nasal septum. It is tubular in shape, ~ 18 mm in length and opens in the rostral region of the nasal cavity and with a blind caudal end. Its lumen is lined by sensory (SE) and nonsensory (NSE) epithelium. The SE shows sensory, supporting and basal cells whereas the NSE contains ciliated and nonciliated secretory cells and basal cells. At the ultrastructural level, the sensory cells appear as bipolar neurons with conspicuous microvilli on their free surface. The supporting cells of the SE contain numerous membrane-bound vesicles in their apical regions. A peculiar feature not found in other mammals, is the presence of concentric whorls of RER cisterns frequently observed in their basal expansions. Infiltrating plasma cells can be detected in the SE basal region close to the dorsal junctional area. This region also exhibits an unusual type of basal cell, probably responsible for the generation of new vomeronasal receptor neurons. The ciliated NSE cells exhibit numerous ovoids or irregularly shaped membranous protrusions projecting from the plasma membrane of the cilia. As far as we know, this is the first study reporting the presence of this feature in ciliated NSE cells. The nonciliated cells are characterised by scarce large secretory granules and apical microvilli. The vomeronasal glands are compound-branched tubuloacinar glands with serous acinar cells. Four types of secretory granules are present. The ducts of these glands reach the lumen in the dorsolateral region between the NSE and SE. Hypolemmal nerve terminals were observed contacting secretory cells. Fenestrated and nonfenestrated capillaries constitute the vascular supply to these glands. Plasma cells, intimately associated with acinar cells, were frequently observed.  |l eng 
593 |a Institute of Neurosciences, University of Buenos Aires, Buenos Aires, Argentina 
593 |a Faculty of Medicine, University of Morón, Morón, Argentina 
593 |a Instituto de Neurociencia (CONICET), FCEyN, Ciudad Universitaria, (1428) Buenos Aires, Argentina 
690 1 0 |a CHEMORECEPTION 
690 1 0 |a JACOBSON'S ORGAN 
690 1 0 |a OLFACTION 
690 1 0 |a VOMERONASAL GLANDS 
690 1 0 |a ACINAR CELL 
690 1 0 |a ANIMAL TISSUE 
690 1 0 |a ARMADILLO 
690 1 0 |a ARTICLE 
690 1 0 |a BASAL CELL 
690 1 0 |a CAPILLARY PROLIFERATION 
690 1 0 |a CELL INFILTRATION 
690 1 0 |a CELL MEMBRANE 
690 1 0 |a CELL SURFACE 
690 1 0 |a CELL ULTRASTRUCTURE 
690 1 0 |a CELL VACUOLE 
690 1 0 |a CHEMORECEPTOR 
690 1 0 |a CILIATED EPITHELIUM 
690 1 0 |a ELECTRON MICROSCOPY 
690 1 0 |a FEMALE 
690 1 0 |a MALE 
690 1 0 |a MEMBRANE BINDING 
690 1 0 |a MICROVILLUS 
690 1 0 |a NERVE CELL 
690 1 0 |a NERVE ENDING 
690 1 0 |a NEUROEPITHELIUM 
690 1 0 |a NONHUMAN 
690 1 0 |a NOSE CAVITY 
690 1 0 |a NOSE SEPTUM 
690 1 0 |a OLFACTORY EPITHELIUM 
690 1 0 |a PLASMA CELL 
690 1 0 |a PRIORITY JOURNAL 
690 1 0 |a PSEUDOPODIUM 
690 1 0 |a SECRETORY CELL 
690 1 0 |a SECRETORY GRANULE 
690 1 0 |a SENSORY NERVE CELL 
690 1 0 |a VOMERONASAL ORGAN 
690 1 0 |a ANIMALS 
690 1 0 |a ARMADILLOS 
690 1 0 |a MICROSCOPY, ELECTRON 
690 1 0 |a VOMERONASAL ORGAN 
700 1 |a Aldana Marcos, H.J. 
700 1 |a Ferrari, C.C. 
700 1 |a Affanni, J.M. 
773 0 |d 1999  |g v. 195  |h pp. 587-604  |k n. 4  |p J. Anat.  |x 00218782  |w (AR-BaUEN)CENRE-5403  |t Journal of Anatomy 
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856 4 0 |u https://hdl.handle.net/20.500.12110/paper_00218782_v195_n4_p587_Carmanchahi  |y Handle 
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