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DR. FATIMA HANNEM MOUSTAFA LATERAL VENTRICLE Lateral Ventricle It is a cavity present in each cerebral hemisphere. It communicates with the third ventricle by the interventricular foramen. It have a dilatation called collateral trigone at the meeting of the floor of both inferior and posterior horns. Its parts are: Anterior horn in the frontal lobe. It lies anterior to the interventricular foramen. Central part in the parietal lobe. It lies behind the interventricular foramen. Posterior horn in the occipital lobe. It begins at the splenium of the corpus callosum and extends posteriorly into the occipital lobe. Inferior horn in the temporal lobe. It passes downwards behind the thalamus and then anteriorly into the temporal lobe to end the uncus. * ** Anterior horn: Lateral wall: Head of caudate nucleus Medial wall: Septum pellucidum* Roof: Trunk ( body ) of corpus callosum Floor: Rostrum of corpus callosum** Anterior wall: Genu of corpus callosum Central part ( body ): Roof: Body of corpus callosum Medial wall: Septum pellucidum Floor from lateral to medial side: 1- Body of caudate nucleus 2- Stria terminalis ( fibers which arise in amygdaloid nucleus and pass with the fornix to grey matter around the anterior commeissure). 3- Thalamostriate vein 4- Upper part of the thalamus 5- Choroid plexus 6- Fornix which covers the medial part of the thalamus. Posterior horn Its roof and lateral wall are formed by the tapetum of corpus callosum which is the posterior fibers of the trunk and fibers of the splenium. Medial wall presents two elevations: Superiorly: The bulb of posterior horn which is produced by the fibers of forceps major that arise from the splenial fibers. Inferiorly: The calcar avis which is produced by infolded cortex of the anterior part of the calcarine sulcus. N.B: Posteriorly, the lateral and the medial walls meet each other. Or the floor is made by the tapetum. Inferior horn Roof: Tail of caudate nucleus and stria terminalis. Lateral wall: Tapetum of corpus callosum. Medially: Choroid fissure with choroid plexus. Floor: from lateral to medial side 1- Collateral eminence ( produced by middle part of collateral sulcus ). 2- Hippcampus which is covered by a layer of nerve fibers called alveus. 3- Fimbria which is formed by the fibers of the alveus