Assuntos
Raquianestesia , Medula Espinal/anatomia & histologia , Adulto , Raquianestesia/história , Anestésicos Locais/administração & dosagem , Anestésicos Locais/farmacologia , Animais , Cauda Equina/anatomia & histologia , Líquido Cefalorraquidiano/fisiologia , Cocaína/administração & dosagem , Cocaína/farmacologia , Espaço Epidural/anatomia & histologia , História do Século XIX , História do Século XX , Humanos , Síndromes de Compressão Nervosa/fisiopatologia , Medula Espinal/irrigação sanguínea , Espaço Subaracnóideo/anatomia & histologiaRESUMO
Data on the morphology, relative growth and sexual dimorphism of the os coxae of a digging form of the northern water vole Arvicola terrestris (A.t. monticola) are given. Two hundred ninety-nine specimens (146 males and 153 females) caught in the Aran Valley (Spanish Pyrenees) were analyzed. The specimens were distributed into six classes of relative age, according to the skull morphology, kind of coat, moulting state, weight and sexual state. The morphological features of the os coxae in these specimens are similar to those described in other species of Arvicolidae. The hormonal effect upon the pelvis in adult females during pregnancy and parturition leads to the appearance of marked intersexual differences in the obturator foramen length, the pubis length, the pelvis length and, specially, in the pelvis height and the pubis width. By means of Becker's and Dunmire's procedures both sexes can be correctly discriminated in a 78.87 and a 76.4% respectively. Conjugating the variation patterns obtained with Becker's index and the pelvis height, we have obtained a more effective method of sexual differentiation (an 85.51% of correct discrimination).
Assuntos
Arvicolinae/anatomia & histologia , Ossos Pélvicos/anatomia & histologia , Caracteres Sexuais , Animais , Feminino , Masculino , GravidezRESUMO
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 malformation has been described at such an early (embryonal) stage of development. Many theories have tried to explain the pathogenesis of this malformation. Our studies agree with the theory that proposes a delay in tubular canalization, to which changes in the structure of the tubular wall might be added.