A Tejedo-Mateu

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In the present study, the results obtained after embryonic movements were paralyzed are described. Paralysis was produced by succinylcholine administered to chicken embryos during Hamburger-Hamilton's stages 25-29. The study of microscopic sections across all the articulations emphasize the absence of articular cavity formation. The cavities were replaced(More)
This report describes a human embryo with a length of 12 mm (horizon XVII Streeterm 35 +/- 1 day old), in which the following malformations appear: Dilation on both sides of the Wolffian ducts, and the more caudal mesonephritic glomerules (mesohydronephrosis). Dilatation of both ureters and renal pelvis (uretero-hydronephrosis). These malformations are the(More)
Major controversies still exist regarding the terminology, the etiology and the pathogenesis of congenital obstructive diseases of the ureter. To try to provide some additional information to this controversial subject, a comparative study of ureteral development in rat and human embryos, using light and electron microscopy, has been performed. During fetal(More)
In this work, after the study of 45 normal human embryos of 5-55 mm from vertex to coccyx, it is shown that the ureteric ducts, which in the first phases of development are permeable (embryos of 5-13 mm), constantly undergo a process of obstruction and posterior recanalization of their lumen, which takes place when they are from 14 to 22 mm. These processes(More)
This is a comparative study of the metanephric development of 1 abnormal and 7 normal human fetuses, all of them measuring approximately 41 mm in vertex-coccyx length (48-50 days of gestation). The abnormal fetus presented with dilatation of the collecting tubules and is, in accordance with our review of current literature, the first case in which this(More)
Congenital diseases of the ureter form a broad sub-section of urology, where nomenclature is not clear and much less their etiopathogeny. In attempt to clear this up, we present the morphological study of ureteral development throughout the whole embryonic period, in both human and rat embryos, by means of the use of optical and electronic microscopy. After(More)
The cecoappendicular area of 14 human embryos with a length ranging from 6 to 17 mm from vertex to coccyx (28 to 48 days old; Carnegie stages 13 to 19) was studied. The appendix is not an atrophic remain of the caecum, it develops at the same time as the caecum. The first morphological anlage of the organ is observed in human embryos from 6 to 10 mm (28 to(More)
Ten human embryos ranging from 10 to 20 mm in vertex-coccyx length (Horizons XVI and XVII Streeter) aged between 33 +/- 1 and 39 +/- 1 days, were studied in order to interpret the mechanism which determines the displacement of the ureter from the dorsal part of the Wolffian duct toward the lateral wall of the bladder. We demonstrated that this movement(More)
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