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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo morfol?gico(anat?mico e histol?gico) do sistema tegumentar de hydromedusa maximiliani (Mikan, 1820) (testudines, chelidae) e phrynops geoffroanus (Schweigger, 1812) (testudines, chelidae) / Morphological study (anatomical and histological) of the tegumentary system of Hydromedusa maximiliani (Mikan, 1820) (Testudines, Chelidae) e Phrynops geoffroanus (Schweigger, 1812) (Testudines, Chelidae)

Novelli, Iara Alves 21 March 2011 (has links)
Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2016-10-10T12:06:07Z No. of bitstreams: 1 2011 - Iara Alves Novelli.pdf: 8629253 bytes, checksum: 80ff4026ca5aacf3a480c2a9ebcfce24 (MD5) / Made available in DSpace on 2016-10-10T12:06:07Z (GMT). No. of bitstreams: 1 2011 - Iara Alves Novelli.pdf: 8629253 bytes, checksum: 80ff4026ca5aacf3a480c2a9ebcfce24 (MD5) Previous issue date: 2011-03-21 / The chelonian uses tactile, visual, olfactory and chemical signs during the social interactions. The chemical communication sign may have a highest importance in the space orientation and sexual behavior displayed by the chelonian during the reproductive period. There are not histological and morphological studies of the Brazilian chelonian species tegumental appendices, like Hydromedusa maximiliani and Phrynops geoffroanus. So, the actual study had the goal to describe and compare morphologically and histologically the tegumental appendices from two Brazilian tortoise species which belong to the Chelidae family. For this study, it was used adult specimens from the Cole??o Herpetol?gica do Departamento de Zoologia da Universidade Federal de Juiz de Fora of H. maximiliani (2 males and 2 females) and P. geoffroanus (4 males and 4 females), totalizing 12 specimens. The analysis of the external surface neck, head and chin region was done. The animals were dissected using stereoscopic microscope to take samples out of the epidermis and dermis from the neck and head region. To the microscopic analysis, it was done the routine techniques that are used in the histological studies. In P. geoffroanus, the keratinized epidermis layer is thicker when compared to the same epidermis layer of H. maximiliani. It was observed that in P. geoffroanus and H. maximiliani these regions may present epidermis invaginations with the detachments of the most external keratin layers. The histological and histochemical study done in the epidermis cuts of the specimens H. maximiliani and P. geoffroanus haven?t evidenced the presence of submandibular gland. The PAS method hasn?t shown the presence of neutral mucopolysaccharides in this submandibular gland, which are products part of the secretions produced by the exocrine glands. In this study, it was observed that the dewlap presented in P. geoffroanus are cylindrical tegumental appendices presented in the mandibular symphysis posterior region, which occurs in pairs, constituting of epidermis and dermis, and with a great concentration of nervous terminations. In the actual study, the P. geoffroanus specimens macroscopically presented conical shape tubers, rarely pointed and also with verrucous shape, visible in the dorsal and lateral region, from the anterior part up to the posterior part of the neck, not presented in the ventral region of the neck, which presents slots, grooves and depressions in the epidermis. In the actual study, it wasn?t observed morphological and histological differences regarding the tubers when compared by gender. In H. maximiliani the tubers are irregularly distributed in the lateral and dorsal regions of the neck, being absent in the region of the head and in the ventral region of the neck. They present pointed and tray shape, different from what was observed in the P. geoffroanus specimens. The tubers presented in the two studied species are different in macroscopic terms, but all of them present a random disposition and are also absent in the ventral region of the neck. For the two types of tegumental annexes (tubers, dewlap) analyzed in this study, it was verified that there are not differences between the genders. / Os quel?nios empregam sinais t?teis, visuais, olfativos e qu?micos durante as intera??es sociais. A comunica??o usando sinais qu?micos pode ter uma import?ncia maior na orienta??o espacial e comportamento sexual exibidos pelos quel?nios durante o per?odo reprodutivo. S?o inexistentes os estudos histol?gicos e morfol?gicos dos ap?ndices tegument?rios das esp?cies de quel?nios brasileiros, como Hydromedusa maximiliani e Phrynops geoffroanus. Dessa forma, o presente estudo teve como objetivos descrever e comparar morfol?gica e histologicamente os anexos tegumentares de duas esp?cies brasileiras de c?gados pertencentes ? Fam?lia Chelidae. Para esse estudo foram utilizados esp?cimes adultos de H. maximiliani (dois machos e duas f?meas) e P. geoffroanus (quatro machos e quatro f?meas), totalizando 12 esp?cimes, provenientes da Cole??o Herpetol?gica do Departamento de Zoologia da Universidade Federal de Juiz de Fora Foi realizada a an?lise da superf?cie externa da regi?o do pesco?o, cabe?a e da regi?o mentoniana. Os animais foram dissecados sob microsc?pio estereosc?pico para retirada de amostras da epiderme e derme das regi?es da cabe?a e pesco?o. Para an?lise microsc?pica foram realizados as t?cnicas de rotina utilizadas nos estudos de histologia. Em P. geoffroanus a camada queratinizada da epiderme ? mais espessa quando comparada com a mesma camada na epiderme de H. maximiliani. Foi observado em P. geoffroanus e H. maximiliani que essas regi?es podem apresentar invagina??es da epiderme com o desprendimento das camadas mais externas de queratina. O estudo histol?gico e histoqu?mico realizado nos cortes da epiderme de ambas esp?cies de, n?o evidenciou a presen?a da gl?ndula submandibular. O m?todo de PAS n?o mostrou a presen?a de mucopolissacar?deos neutros nessa regi?o submandibular, que s?o produtos que fazem parte das secre??es produzidas por gl?ndulas ex?crinas. Nesse estudo observou-se que as barbelas presentes em P. geoffroanus s?o ap?ndices tegumentares cil?ndricos presentes na regi?o posterior da s?nfise mandibular, que ocorrem aos pares, constituindo-se de epiderme e derme, e com grande concentra??o de termina??es nervosas. No presente estudo, os esp?cimes de P. geoffroanus macroscopicamente apresentaram tub?rculos de forma c?nica, raramente pontiagudos, e tamb?m de formato verrucoso, vis?veis na regi?o dorsal e lateral desde a parte anterior at? a parte posterior do pesco?o, n?o estando presentes na regi?o ventral do pesco?o, que apresenta ranhuras, estrias e depress?es da epiderme. No presente estudo n?o foram observadas diferen?as morfol?gicas e histol?gicas em rela??o aos tub?rculos quando comparados por sexo. Em H. maximiliani os tub?rculos est?o distribu?dos de forma irregular nas regi?es laterais e dorsais do pesco?o, estando ausentes na regi?o da cabe?a e na regi?o ventral do pesco?o. Apresentam formato pontiagudo e de tabuleiro, diferente do que foi observado nos esp?cimes de P. geoffroanus. Os tub?rculos presentes nas duas esp?cies estudadas s?o diferentes em termos macrosc?picos, mas todos apresentam uma disposi??o aleat?ria e est?o tamb?m ausentes na regi?o ventral do pesco?o. Para os dois tipos de anexos do tegumento (tub?rculos, barbelas) analisados nesse estudo, verificou-se que n?o existe diferen?a entre os sexos.

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