Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | Springer Nature Link |
|---|---|
| Author | Bubenik, G. A. Jacobson, J. P. |
| Copyright Year | 2002 |
| Abstract | Histological structure of intraabdominally located testes and epididymis of cryptorchid black-tailed deer (Odocoileus hemionus sitkensis) of Kodiak island, Alaska was compared with the gonads of intact deer sampled in the same region. The deer were harvested during the rut and their age, antler and gonadal status were recorded. The seminiferous tubules of cryptorchid bucks were malformed, lined only with Sertoli cells and were devoid of any spermatogenetic activity. A great number of blood vessels including arteries were detected within the remnants of tubules. In addition, inclusions comprised of concentric lamellae, containing most probably calcium salts, were observed in the lumen of degenerated tubules. Conversely, we encountered large areas of cells resembling Leydig cells, exhibiting an abundant cytoplasm. The production of testosterone in these cells would explain why an almost normal antler shape and a quasi-normal antler cycle were often observed in many bilateral cryptorchids. Epididymides accompanying the ectopic testes were devoid of any spermatozoa but otherwise were of almost normal size; only in the bilateral cryptorchid the epithelium was partly malformed. It was concluded, that hypoplastic or cryptorchid testes cause male infertility but the production of testosterone in the less affected Leydig cells is sufficient to initiate and control the antler cycle.Die histologische Struktur intraabdominaler Hoden und Nebenhoden von kryptorchiden Schwarzwedelhirschen (Odocoileus hemionus sitkensis) der Kodiak-Insel, Alaska, wurde mit derjenigen der Gonaden normaler Hirsche aus dem gleichen Gebiet verglichen. Die Hirsche wurden zur Brunftzeit erlegt und das Alter sowie die Gonaden- und Geweihausbildung festgestellt. Die Hodenkanälchen der kryptorchen Hirsche waren missgebildet, lediglich von Sertoli-Zellen begrenzt und ohne spermatogene Aktivität. In dem abnormen Gewebe fanden sich viele Blutgefäße, einige davon Arterien. Zusätzlich wurden im Lumen der degenerierten Samenkanälchen EinschlÜsse in Form konzentrischer Lamellen beobachtet, die höchst wahrscheinlich Kalziumsalze enthielten. Wir fanden dagegen große Bereiche mit Zellen, die Leydig-Zellen glichen und sehr viel Zytoplasma enthielten. Die Testosteronproduktion dieser Zellen wäre die Erklärung dafÜr, dass bei vielen bilateralen Kryptorchen annähernd normal geformte Geweihe und ein nahezu normaler Geweihzyklus beobachtet wurden. Die Nebenhoden der heterotopen Testes enthielten keine Spermatozoen, waren jedoch von normaler Größe. Lediglich bei den beidseitigen Kryptorchen war deas Epithel teilweise abnorm ausgebildet. Aus den Befunden wird geschlossen, dass hypoplastische bzw. nicht deszendierte Hoden Sterilität bedingen, dass aber die Testosteronproduktion der weniger betroffenen Leydig-Zellen zur Initiierung und Steuerung des Geweihzyklus ausreicht.La structure histologique des testicules et épididymes intra-abdominales de chevreuils à queue noire (Odocoileus hemionus sitkensis) de l'Ile de Kodiak en Alaska a été comparée à celle des gonades de chevreuils normaux issus du mÊme endroit. Les chevreuils mâles ont été tirés durant le rut et leur âge ainsi que le développement des gonades et des bois ont été relevés. Les tubes séminifères des chevreuils cryptorchides, déformés; n'étaient bordés que par des cellules de Sertoli et dépourvus de toute activité spermatogénique. Dans les tissus anormaux se trouvaient de nombreux vaisseaux sanguins en ce compris des artères. En outre, dans le lumen des tubules dégénérés, des inclusions sous forme de lamelles concentriques ont été observées, contenant plus que probablement des sels de Calcium. Par contre, nous avons trouvé de nombreuses plages avec des cellules qui ressemblaient à des cellules de Leydig et qui contenaient beaucoup de cytoplasme. La production de testotérone de ces cellules explique pourquoi, chez de nombreux cryptorchides bilatéraux, on observe souvent une formation de bois et un cycle de bois presque normaux. Les épididymes accompagnant les testicules hétérotopes étaient dépourvus de tout spermatozoÏde tout en présentant une taille normale. Chez les seuls cryptorchides bilatéraux, l'épithélium présentait un développement partiellement anormal.En conclusion, les testicules hypoplastiques ou cryptorchides provoquent une stérilité mâle qui assure cependant une production de testotérone des cellules de Leydig — en l'occurrence moins affectées -, production qui s'avère suffisante pour initier et contrÔler le cycle des bois. |
| Starting Page | 234 |
| Ending Page | 243 |
| Page Count | 10 |
| File Format | |
| ISSN | 00442887 |
| Journal | European Journal of Wildlife Research |
| Volume Number | 48 |
| Issue Number | 4 |
| e-ISSN | 14390574 |
| Language | French |
| Publisher | Springer-Verlag |
| Publisher Date | 2002-01-01 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Black-tailed deer testes epididymis spermatogenesis antlers cryptorchism histology Animal Ecology Zoology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Animal Science and Zoology |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|