Browsing by Author "Malobabic, S. (7004232500)"

[No abstract available]

Fine arterial branches on the superior surface of corpus callosum were investigated on 22 human brains under stereomicroscope. These branches were directed toward: 1. the upper surface of corpus callosum (3-6 branches, mean 8), 2. the depths of the sulcus corporis callosi (4-13 branches, mean 7), and 3. the cingulate gyrus (1-10 branches, mean 5). All the vessels composing the pericallosal pial plexus have a uniformed caliber of 0.9-0.6 mm at their origins, and 0.7-0.3 mm after branching. In 9 cases a longitudinal vessel within the stria longitudinalis medialis, connected with the pial plexus was found. Important details of morphology of this plexus and their significance are discussed.

[No abstract available]

Background: The available anatomical data about diameters of inflow vessels to the circle of Willis reflect various diagnostic and imaging methods used, sample sizes, levels of measurements, and lack of possible specific ethnic, regional or genetic data. Additionally, the data are often without distinctions about left-right or sex. Materials and methods: Therefore, using computed tomography angiography (CTA) we investigated diameters of internal carotid (ICA) and vertebral (VA) arteries in 70 adult persons (28-75 years) of both sexes (34 males and 36 females), at predefined cervical parts of ICA (2 cm above carotid bifurcation) and of VA (5 mm before VA penetrated the dura). Results: Sex differences were expressed as highly significant larger diameters of left VA (LVA) in males (3.49 mm) than in females (3.00 mm), and as significantly larger diameters of right VA (RVA) in males (3.20 mm) than in females (2.82 mm), as well as of right ICA (RICA) diameters in males (5.04 mm) than in females (4.56 mm), but without such difference for left ICA (LICA) between males (4.82 mm) and females (4.60 mm). Intrasex (in males or in females) left-right differences of ICA and VA diameters were not significant. Significant positive correlations were found in females between RICA and RVA, and in males between RICA and LICA. Calculated mean sum of ipsilateral diameters of right arteries (RAA = RICA + RVA) was in males 8.25 mm, in females 7.38 mm, and of left arteries (LAA = LICA + LVA) was in males 8.31, and in females 7.60 mm, without statistically significant difference between RAA and LAA, neither in males, nor in females. Statistically highly significant larger sums of diameters were in males than in females for both, RAA and LAA. Conclusions: Our findings, as the first data about diameters of ICA and VA systematically obtained by CTA in the population of western Balkans, suggest that in the studies of these diameters is absolutely necessary to analyse separately the data for sex, and to use defined standard levels. Copyright © 2020 Via Medica.

The arteries of the fourth velum) roof were investigated on 25 prepared rhombencephalons and 30 angiograms (adult persons). Superior portion of the roof (superior medullary vellum) is supplied by small branches originating from both the terminal branches of the superior cerebellar artery. These small branches descend over the superior medullary velum and superior cerebellar peduncles, and can be divided in the lateral and the medial group. In the apical area of fastigium there are anastomoses between the branches belonging to the systems of the superior and the posterior inferior cerebellar artery. The inferior portion of the fourth ventricular roof (inferior medullary velum and lamina tectoria) is supplied by numerous fine choroidal branches, usually originating from a retromedullary segment of the posterior inferior cerebellar artery (PICA). This artery is in a more or less close relationship to the inferior portion of the IV ventricular roof, but details of this relationship depend of the length of the arterial retromedullary segment. Further, this length depends mostly on the height of the point of origin of PICA from a. vertebralis. In over 80% of cases this point was in the level of the inferior pole of the olive and the length of retromedullary segment was then relatively great. When the point of origin of PICA was high (level of middle part or superior pole of olive) this segment was shorter and the artery relates only to upper neighbouring parts of the roof. In our material arteries from both sides were never in touch, being separated by the sharp incline of lamina tectoria (caudalmost part of roof) and by the presence of the vermis (more rostrally). The inferior vermian artery (one of the PICA terminal branches) may be in close relationship with the fourth ventricular roof too, usually when the opposite PICA is hypoplastic. In such cases the inferior vermian artery from the side with 'normal' PICA crosses the r481w1≠pyramis uvula or pyramics (10% cases right, 13% left).

11 encephalometric parameters of the corpus callosum and medial hemispheric surface have been measured on 50 human brains fixed in 7% formaline solution. The measurement of linear parameters has been made by using a standardized encephalometric system of reference, based on the bicommissural line which has been widely used in neurosurgery. The applied statistical procedures have shown that the following variables are the most successful in the evaluation and prediction of the change of the midsagittal cross-sectional corpus callosum area in the following order: the thinnest part of the corpus callosum, the corpus callosum length and medial hemispheric border. Their change for the unit value causes an average change of the corpus callosum midsagittal section surface area for the value of the partial regression coefficient with which they are connected. The chosen variables explain only the 45% variability of the cross-sectional corpus callosum surface area, and the remaining variability belongs to some other variables which have not been included in present investigation. The variability of the hemispheric length (74%), the corpus callosum length (65%) and medial hemispheric border length (64%) is most adequately explained on the basis of chosen variables.