Microsurgical anatomy of the arachnoidal trabecular membranes and cisterns at the level of the tentorium

Viñas, Federico C.; Dujovny, Manuel; Fandino, Rafael; Chavez, Victor

doi:10.1080/01616412.1996.11740426

Cited by 45 publications

(19 citation statements)

References 17 publications

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“…Below the tentorial edge, the membrane was continuous with the arachnoid, covering the inferior aspect of the tentorium and posterior fossa dura [5]. Froelich [5] also agreed with other authors that the LM is continuous laterally with the lateral pontomesencephalic membrane [8] that separates the ambient cistern from the cerebellopontine cistern, and with the caudal oculomotor membrane [20][21][22], as they share a common embryological origin [5].…”

Section: Findings Of Froelichmentioning

confidence: 63%

Anatomical variations and neurosurgical significance of Liliequist’s membrane

et al. 2014

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Section: Findings Of Froelichmentioning

confidence: 63%

Anatomical variations and neurosurgical significance of Liliequist’s membrane

et al. 2014

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“…Vinas et al 13 first described 2 arachnoid membranes definitely related to the posterior half of the incisural space-namely, the CPM and the superior cerebellar membrane. We do not agree with their definitions for the following reasons.…”

Section: Discussionmentioning

confidence: 99%

“…[4][5][6]13,15 Therefore, the relevant knowledge is subject to inaccuracies. For example, controversies remain in regard to the following issues.…”

mentioning

confidence: 99%

Arachnoid membranes in the posterior half of the incisural space: an inverted Liliequist membrane–like arachnoid complex

Zhang¹,

Qi²,

Fan³

et al. 2014

JNS

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Object. The aim of this study was to describe the similarity of configuration between the arachnoid complex in the posterior half of the incisural space and the Liliequist membrane.Methods. Microsurgical dissection and anatomical observation were performed in 20 formalin-fixed adult cadaver heads. The origin, distribution, and configuration of the arachnoid membranes and their relationships with the vascular structures in the posterior half of the incisural space were examined.Results. The posterior perimesencephalic membrane and the cerebellar precentral membrane have a common origin at the tentorial edge and form an arachnoid complex strikingly resembling an inverted Liliequist membrane. Asymmetry between sides is not uncommon. If the cerebellar precentral membrane is hypoplastic on one side or both, the well-developed quadrigeminal membrane plays a prominent part in partitioning the subarachnoid space in the posterior half of the incisural space.Conclusions. The arachnoid complex in the posterior half of the incisural space can be regarded as an inverted Liliequist membrane. This concept can help neurosurgeons to gain better understanding of the surgical anatomy at the level of the tentorial incisura.

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“…[18] Within the velum interpositum, the two layers of tela choroidea have always been described to be interconnected by loosely organized or dense trabeculae. [2430] Zhang et al . have recently demonstrated the extension of arachnoid membrane within the whole length of velum interpositum.…”

Section: Anatomy and Variations Of The Velum Interpositummentioning

confidence: 99%

Colloid cysts posterior and anterior to the foramen of Monro: Anatomical features and implications for endoscopic excision

et al. 2014

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Background:Colloid cysts are usually located at the rostral part of the third ventricle in proximity to the foramina of Monro. Some third ventricular colloid cysts, however, attain large sizes, reach a very high distance above the roof of the third ventricle, and pose some challenges during endoscopic excision. These features led to the speculation that for such a pattern of growth to take place, the points of origin of these cysts should be at areas away from the foramina of Monro at which some anatomical “windows” exist that are devoid of compact, closely apposed forniceal structures.Methods:A review of the literature on anatomical variations of the structures in the vicinity of the roof of the third ventricle and on reported cases with similar features was conducted.Results:Colloid cysts may grow vertically up past the roof of the third ventricle through anatomical windows devoid of the mechanical restraint of the forniceal structures.Conclusion:Some anatomical variations of the forniceal structures may allow unusually large sizes and superior vector of growth of a retro- or post-foraminal colloid cyst. Careful preoperative planning and knowledge of the pertinent pathoanatomy of these cysts before endoscopic excision is very important to avoid complications.

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Microsurgical anatomy of the arachnoidal trabecular membranes and cisterns at the level of the tentorium

Cited by 45 publications

References 17 publications

Anatomical variations and neurosurgical significance of Liliequist’s membrane

Anatomical variations and neurosurgical significance of Liliequist’s membrane

Arachnoid membranes in the posterior half of the incisural space: an inverted Liliequist membrane–like arachnoid complex

Colloid cysts posterior and anterior to the foramen of Monro: Anatomical features and implications for endoscopic excision

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