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Exploration of the brain from its basal aspect

Transverse fissure and lateral ventricle exposed by removal of thalamus

Image #7-1

KEYWORDS: Brain, Diencephalon, Telencephalon, Ventricules.

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Exploration of the brain from its basal aspect

Transverse fissure and lateral ventricle exposed by removal of thalamus

The thalamus has now been cut away so that only its most medial and anterior portions remain. The lamina affixa (6), which covered the upper lateral part of the thalamus, is partially removed so that in effect the choroidal fissure (8) is opened from below and one looks directly into the medial part of the body of the lateral ventricle which is collapsed. The roof of the ventricle, formed by the corpus callosum, is seen at (7).

1 .	Frontal part corona radiata
2 .	Ependymal membrane of superior surface of caudate nucleus
3 .	Superior occipitofrontal fasciculus
4 .	Internal capsule (cut across at junction with corona radiata)
5 .	Superior longitudinal fasciculus
6 .	Lamina affixa (partially cut away)
7 .	Corpus callosum (inferior surface visible through body of lateral ventricle)
8 .	Choroid plexus lateral ventricle (attached to head of fornix)
9 .	Choroid plexus inferior horn of lateral ventricle
10 .	Longitudinal fissure (cerebral)
11 .	Anterior communicating artery
12 .	Anterior commissure
13 .	Stria terminalis (note continuity with parolfactory area)
14 .	Anterior perforated substance
15 .	Mamillothalamic tract (Vicq d'Azyr)
16 .	Mamillary body
17 .	Fornix (body)
18 .	Cerebral peduncle
19 .	Dentate fascia (hippocampus)