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Lateral ventricle. Ventriculus lateralis. Paired ventricle which communicates with the third ventricle via the interventricular foramen. It consists of the pars centralis and three horns (anterior, posterior, inferior). A Central part. Pars centralis. Middle portion of lateral ventricle located above the thalamus and below the corpus callosum. It contains a part of the choroid plexus. A

Interventricular foramen. Foramen inter-ventriculare. Passage behind and below the genuofthe fornix through which the lateral and third ventricles communicate. D Anterior horn. Cornu frontale (anterius). Partof the lateral ventricle that extends forward from the interventricular foramen. It is bounded medially by the septum pellucidum, laterally by the head of the caudate nucleus, superiorly by the trunk of the corpus callosum, anteriorly and in-feriorly by the genu and rostrum of the corpus callosum. A

Posterior horn. Cornu occipitale (posterius). Part ofthe lateral ventricle that extends into the occipital lobe. A

Inferior horn. Cornu temporale (inferius). Part of the lateral ventricle that accompanies the hippocampus laterally and contains a part of the choroid plexus. A

Stria terminalis. Longitudinal band of myeli-nated fibers located in the angle between the thalamus and caudate nucleus above the thalamostriate vein. It arises from the amygdaloid body. B

Lamina affixa. Floor of lateral ventricle between the stria terminalis and tenia choroidea. B Choroid fissure. Fissura choroidea. Cleft between the thalamus and fornix for passage of the choroid plexus into the lateral ventricle. In the inferior horn it lies between the fimbria of the hippocampus and the stria terminalis. B Tenia choroidea. Taenia choroidea. Line of attachment of the lateral choroid plexus to the thalamus. It becomes visible after removal of the choroid plexus. B

Choroid plexus of lateral ventricle. Plexus choroideus ventriculi lateralis. Highly vascu-larized, fringelike villous folds that protrude into the lateral ventricle through the choroid fissure. They extend anteriorly to the interventric-ular foramen and posteriorly into the inferior horn. B

Bulb of posterior horn. Bulbus cornus occipi-talis (posterioris). Enlargement on the medial side of the posterior horn caused by fibers of the splenium of the corpus callosum. C Calcar avis. Enlargement on the medial side of the posterior horn produced by the calcarine fissure. C

Collateral eminence. Eminentia collateralis. Elevation in the lateral floor of the inferior horn near the hippocampus. It is caused by the collateral sulcus. C

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