[Anatomo-microscopic study of the walls of the superior cerebral veins]

The authors studied the structure and disposition of the tissue components of the tunicae of the superior cerebral veins at the levels of the subdural space and of the superior sagittal sinus. It was observed that, at the level of the transition vein-sinus, the tunica adventitia is formed by numerous and voluminous fascicles of collagenic fibers and thin elastic fibers, which describe system spirals more opened distant to the superior sagittal sinus. The tunica intima of these vascular segments exhibits an endothelium resting on a network of elastic fibers, which may play the role of an internal elastic lamina. From the lateral, superior and inferior walls of the sinus, there originates a connective system whose fascicles of collagenic and elastic fibers incorporated to the vascular walls after describing a stretch in spiral around the vascular lumen. The authors admit that this dispositive connective collagenic-elastic, more the presence of the septums fibrous of the venous walls, give to the superior cerebral veins one property of the lengthening and of the shortening of the walls, in order to regulate the blood debit to the sinus. Also, ist was noted that, at the level of the subdural space, vascular walls exhibits a fibrous structure similar to that of the sinus, and are fixed to the interne face of the cranial dura-mater, to the lateral wall of the sinus and to the falx cerebri. These adherences contribute to preserve the integrity of the walls and even of the resistance during the elevation of the venous pression, preventing to the collapsus of these veins.