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Biomedical subjects

A Vaida

Publications and source records attributed to A Vaida.

26 records · Page 2Linked to original sources
PubMedDate not supplied

The portal vein and its main affluents. An anatomic and morphometric study.

There are reported the results of certain measurements made on 158 human cadavers of both sexes. A series of main parameters are given, such as the distance between the superior mesenteric vein and on the one hand its confluence with other vessels and on the other hand the pancreas and the horizontal part of the duodenum: the distance between the superior mesenteric vein together with the portal vein, and the inferior caval vein; the diameters of the portal trunk and the confluence angle between the roots of the portal vein. The results reflect the possibility to perform a troncular portocaval anastomosis in at least 90 per cent of the cases. The authors' attention was, however, directed towards the anatomy of the superior mesenteric vein, as this vessel is preferred by some surgeons in the achievement of the portocaval anastomosis.

Female↗
PubMedDate not supplied

Ontogenetic modelling of the petrous part of the temporal bone in man.

The inner and the outer layers of the petrous part of the temporal bone (p.p.t.b.) become definitive until the sixth intrauterine month. Therefore, the growth and modelling of the p.p.t.b. are subsequently achieved by apposition of the periosteal outer layer. Periosteal apposition takes place in the form of plates appearing successively. The author identified seven such plates concentrated around the canals passing through the p.p.t.b. and describes them in fetuses, premature infants and adults. Periosteal ossification may cause compression of nerves passing through the p.p.t.b. thus inducing the onset of Ménière's disease. The anatomical peculiarities determined by the periosteal bone must be thoroughly known to permit high-accuracy surgical interventions at the p.p.t.b. level.

Adult↗
PubMedDate not supplied

Action of 6-hydroxydopamine on two parameters of motor learning.

In rats injected in the cerebral ventricle with 250 micrograms of 6-hydroxydopamine a significant blockade of the improvement of swimming performance due to training occurs. The central injection of 6-OHDA leads to a lengthening of the total latency time (LT) of active conditioned reaction in shuttle box and of the LT of netative escape responses during learning, but not of the positive avoidance responses. 6-OHDA injected after the learing schedule (12 days) has no effect on the LT during relearning and extinction. Therefore a partial destruction of central monoaminergic, and especially of dopaminergic, neurons impairs particularly the acquisition but not the retention of the motor program.

Animals↗
PubMedDate not supplied

New data concerning the effects of 6-hydroxydopamine on the exercise performance in rats.

An injection of 250 micrograms 6-OHDA into the right cerebral ventricle of adult rats tested after 45 days led to a reduction of the run performance on the treadmill compared with the control group, but only in the first period of this test, repeated 10-11 times, every 2-3 days. This behavior was more obvious in male and in exercise-enduring rats. The histological examination proved partial destruction of central monoaminergic (especially dopaminergic) structures in the 6-OHDA treated rats. 24-48 hours after peripheral injections of 6-OHDA (100 mg/kg b. w.) a considerable reduction of the run and swim performance (acute exercise till exhaustion) occurred. Falck's histofluorescence method proved large destructions of the noradrenergic innervation in the iris; 6-OHDA injected i.p. into neonatal rats had similar effects.

Animals↗