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Coronal section through frontal lobe at level of interventricular foramen of Monro

Surgical Correlation


Coronal section through frontal lobe at level of interventricular foramen of Monro.  The dorsal parts of the cerebral hemispheres have been dissected to expose the floors of the lateral ventricles and the interventricular foramina (IVF) of Monro.  The section is viewed from the anterior direction.  The IVF of Monro are short tunnel-like openings that connect the lateral ventricles with the midline III ventricle.  Tufts of choroid plexus run along the floor of the lateral ventricle and curve inferiorly through the IVF, immediately anterior to the rostral pole of the thalamus.  The choroid plexus then turns caudally and continues (not visible in this image) into the roof of the III ventricle.   The columns of the fornices, suspended from the midline septum pellucidum, curve inferiorly and caudally to form the anterior wall of the IVF of Monro.  Near the base of the forebrain, on either side of midline, lie the head of the caudate nucleus and the rostral putamen; the latter nuclei are separated incompletely from one another by the anterior limb of the internal capsule.  Inferiorly and medially, the head of the caudate and the putamen fuse to form the nucleus accumbens, or ventral striatum.  The anterior regions of the basal ganglia and the anterior limb of the internal capsule receive their blood supply from penetrating branches of the anterior cerebral artery (ACA), primarily the recurrent artery of Heubner, or medial striate artery. (Image courtesy of AL Rhoton, Jr.)

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