Relevant Anatomy

As a variety of eloquent structures surround the third and lateral ventricles, a thorough knowledge of the related anatomy, including neural and vascular structures, is essential in evaluating neuroimaging studies and in planning surgery.

The roof of the third ventricle is formed by the tela choroidea and the forniceal body. The anterior wall is formed by the lamina terminalis, forniceal columns, optic recess and the foramen of Monro. Medial surface of the thalamus forms the posterosuperior aspect of the lateral wall of the third ventricle. Separated by the hypo-thalamic sulcus, the hypothalamus constitutes the antero-inferior aspect of the lateral wall. The third ventricle floor consists of the optic chiasm, the tuber cinerum and infundibulum, mammil-lary bodies, posterior perforated substance and the superior aspect of the tegmentum. Perical-losal arteries, medial posterior choroidal arteries, internal cerebral veins and the branches of the circle of Willis inferiorly are vascular structures of critical importance in this region.

The lateral ventricles extend from the foramen of Monro anteriorly into the frontal lobe as the frontal horn. The walls of each frontal horn are formed by the genu of the corpus callosum anteriorly; by the septum pellucidum, the foramen of Monro and the forniceal column medially; and by the head of the caudate nucleus laterally. The floor is formed by the rostrum of the corpus callosum. The choroid plexus passes through the foramen of Monro and curves posteriorly to line the roof of the third ventricle. The anteromedially located septal vein joins the posterolateral^ located thalamostriate vein at the foramen of Monro to form the inferior cerebral vein. The body of each lateral ventricle extends from the posterior aspect of the foramen of Monro to the junction of the corpus callosum with the fornix. The body is surrounded by the body of the caudate nucleus laterally and by the corpus callosum superiorly. The striothala-mic sulcus divides the thalamus from the caudate nucleus and houses the thalamostriate vein and the stria terminalis. Tumors located in the body of the lateral ventricles derive most of their blood supply from the posterior lateral choroidal arteries. Caudal to the thalamus, the lateral ventricle curves laterally and anteriorly forming the temporal horn. Posteriorly from the junction of the body and the temporal horn extends the occipital horn. The triangular expansion of the ventricle between the occipital and temporal horns is the atrium, i.e. the trigone. The visual projection fibers are located laterally to the atrium. Tumors located in the atrium are supplied from the anterior choroidal and posterior lateral choroidal arteries.

Cure Your Yeast Infection For Good

Cure Your Yeast Infection For Good

The term vaginitis is one that is applied to any inflammation or infection of the vagina, and there are many different conditions that are categorized together under this ‘broad’ heading, including bacterial vaginosis, trichomoniasis and non-infectious vaginitis.

Get My Free Ebook


Post a comment