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The parasellar dura mater and adjacent dura: a microsurgical and light microscopic study in fetal materials

Author(s): Vucetic RR

Journal: Neuroanatomy
ISSN 1303-1783

Volume: 4;
Issue: 1;
Start page: 2;
Date: 2005;
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Keywords: parasellar region | dura mater | cavernous sinus | venous space

The parasellar dura mater should be distinguished from the adjacent dura because the cavernous sinus, the internal carotid artery, and certain cranial nerves passes through it. The purpose of this study is to demonstrate the difference between the structure of the parasellar and the adjacent dura mater. The study was held with 80 fetuses at a gestational age of 20-40 weeks. Microdissection and histological investigation was performed without decalcification. The results are as follows: The meningeal layer of the parasellar dura mater was thicker from that of the adjacent dura, but their periosteal layers had similar thickness. The meningeal layer of the cranial dura mater had a multilayered structure, and also two types of lamellas have been found, the compact and the loose lamellas. Four compact and four loose lamellas of the meningeal layer of the parasellar dura mater have been shown by dissection and histological method. Through these lamellas are passing the cranial nerves III, IV, V1, V2, V3, VI and their vessels. Through the fourth loose lamellae pass the parasellar portion of the internal carotid artery. In the third and fourth loose lamellas there are venous spaces arranged around the internal carotid artery, which form the cavernous sinus. The compact lamellas are thinner but firmer in comparison to loose lamellas. On the other hand, three compact and three loose lamellas have been found in the meningeal layer of the adjacent dura mater. Neither evident vessels nor nerves have been noticed between these lamellas.

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