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Microsurgical anatomy of Liliequist's membrane demonstrating three-dimensional configuration.
Acta Neurochir (Wien) ; 153(1): 191-200, 2011 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-20936312
OBJECT: Liliequist's membrane (LM) is an important arachnoid structure in the basal cisterns. The relevant anatomic descriptions of this membrane and how many leaves it has are still controversial. The existing anatomical theories do not satisfy the needs of minimally invasive neurosurgery. We aimed to establish the three-dimensional configuration of LM.


Fifteen adult formalin-fixed cadaver heads were dissected under a surgical microscope to carefully observe the arachnoid mater in the suprasellar and post-sellar areas and to investigate the arachnoid structure and its surrounding attachments.


It was found that the LM actually consists of three types of membranes. The diencephalic membrane (DM) was usually attached by the mesencephalic membrane (MM) from underneath, and above DM it was usually a pair of hypothalamic membranes (HMs) extending superomedially. The pair of HMs was stretched between the DM (or MM) and the hypothalamus and were seldom attached to the carotid-chiasmatic walls between the carotid cistern and the chiasmatic cistern. These three types of membranes (DM, MM, and HM) comprised the main arachnoid structure in the anterior incisural space and often presented as four connected leaves. However, only two thirds of the specimens had all three types of membranes, and there was considerable variation in the characteristics and shapes of the membranes among the specimens.


All three types of membranes comprising LM serve as important anatomical landmarks and interfaces for surgical procedures in this area.





Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Aracnoide-Máter / Espaço Subaracnóideo / Encéfalo / Base do Crânio / Fossa Craniana Média Limite: Humanos Idioma: Inglês Revista: Acta Neurochir (Wien) Ano de publicação: 2011 Tipo de documento: Artigo