Transchoroidal approach to the third ventricle: an anatomic study of the choroidal fissure and its clinical application

Neurosurgery
H T WenE de Oliveira

Abstract

We review the anatomic features of the lateral ventricle, the foramen of Monro, the third ventricle, and the choroidal fissure, and we describe the transchoroidal approach to the third ventricle. This approach consists of opening the taenia fornicis of the choroidal fissure in the body of the lateral ventricle and approaching the third ventricle between the two internal cerebral veins. This route allows further posterior enlargement of the foramen of Monro without sacrificing any neural structures. When necessary, the anterior septal vein can be sacrificed. Twenty adult cadaveric brains and four adult cadaveric heads were studied, using a magnification ranging from 3 times to 40 times, after perfusion of the arteries and veins with colored latex. The choroidal fissure is a natural cleft between the thalamus and the fornix, and it is identified by following the choroid plexus in the lateral ventricle. The choroid plexus in the body of the lateral ventricle originates from the tela choroidea of the roof of the third ventricle and is apparently attached to the fornix by the taenia fornicis and to the thalamus by the taenia choroidea. The taenia is actually the ependyma that covers the internal wall of the ventricular cavity and th...Continue Reading

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Citations

Oct 6, 2000·Arquivos de neuro-psiquiatria·J G Vialogo
Sep 18, 2002·Neurosurgery·Albert L Rhoton
Aug 22, 2008·Neurosurgery·Juan C Fernández-MirandaEvandro P de Oliveira
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Dec 23, 2017·Journal of Neurosurgery·Eduardo Carvalhal RibasAlbert Rhoton
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Aug 16, 2021·Neurosurgery·Joao Paulo AlmeidaT Forcht Dagi

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