We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Evolución del descenso testicular en embriones y fetos humanos.
- Authors
Ortiz, M. S.; Ortiz, M. A.; Guidobono, J. A.; Forlino, D.
- Abstract
Introduction: The testicular descent has been an object of multiple studies that try to determine the morfo genetic causes that take it across the development, to its definitive escrotal place, having originated in the abdomen. The target of this work was to study the development of the Testicular Descent (TD) in embryos and human fetuses using 3 (three) methods, correlating the results of each of them. Material and methods: 4 human embryos of the 7th to the 12th week of development were studied through histological study of serialized sections. Also the dissection of abdomen and pelvis of eleven (11) fetuses of 14th to 28th weeks of intrauterine development had been done. Finally, 5 human fetuses stillbirths were evaluated by Magnetic Resonance Imaging (MRI) with a gestational age that goes from the 10th to the 23rd week of gestation. Results: In embryonic stages, the differential characters of the male gonads with the respective elements mesonefros linked to them have been observed; it has been also studied the inguinal ligament of the mesonefros linked particularly to the caudal end of the gonad and their relations with the abdominal wall to the scrotal area. The segments, that are ultimately the testis gubernaculm, are also checked. In the study of fetal material by dissection, we have observed that from the 22 testicles studied, only 5 (22.7%) are located on the LB, the remaininf 17 (77.3%) were below this repair. At 20 weeks of EG, they were below the LB but less than 10 mm of this, and from this age began to exceed this measure. The asymmetry of descent found in the 11 fetuses studied was 72.7% (8 cases), and only 27.3% of the studied specimens are symmetrical at the decline of both gonads. The studies using magnetic resonance imaging in fetuses set without dissect is found the location, the size and position of the gonads left and right showing in a very high percentage an asymmetry of height, and in all cases its strictly display position without abdominal fastening elements. Conclusion: For us there is no active mechanism in the testicular descent to the bags and as in any morphogenetic topic we observed differences in the gonadal location in specimens with comparable age and in the case of limited material up to the 7th month of development practically all the testicles studied were even, at different heights, in the abdomen.
- Publication
Revista Argentina de Anatomia Online, 2016, Vol 7, Issue 2, p57
- ISSN
1853-256X
- Publication type
Article