Ventricles' Occipital Horn, Lateral View

Description

Occipital horn of the lateral ventricle occupies the posterior extension of the ventricular system within the occipital lobe, tapering to a pointed cavity deep to the parieto-occipital region. In lateral perspective, its long axis runs posteriorly from the atrium (trigone), with the roof and lateral wall formed by the tapetum of the corpus callosum and adjacent periventricular white matter. Medially, the ventricular contour relates to the calcar avis, a bulge produced by the calcarine sulcus, while the surrounding occipital white matter lies lateral to the midline falx and tentorial attachment. The horn is narrow. Posterior horn anatomy matters whenever ventricular size is used as a surrogate for intracranial pressure or tissue loss, because occipital horn dilatation can reflect hydrocephalus, posthemorrhagic ventriculomegaly, or ex vacuo enlargement after posterior cerebral infarction and occipital white matter atrophy. Radiology trainees often struggle to separate true ventricular enlargement from widened sulci in the occipital lobe, and a lateral view that isolates the horn’s tapering geometry and its continuity with the atrium helps anchor that distinction. For neurosurgical and neuroanatomy teaching, the relationship of the horn to the calcarine region provides a practical landmark when correlating gross anatomy with axial and coronal CT or MRI slices. Use this illustration in neuroanatomy courseware on the ventricular system, in radiology teaching files addressing ventriculomegaly and hydrocephalus patterns, or in publisher figures explaining periventricular white matter relationships in the occipital lobe. Anatomical accuracy verified by SciePro's Medical Advisory Board.