Bulb Of The Occipital Horn (Medial View)

Description

Bulb of the occipital horn projects into the posterior horn of the lateral ventricle as a rounded prominence along the ventricular wall in the occipital lobe. From a medial perspective, the occipital horn extends posteriorly from the atrium (trigone), with the bulb positioned lateral to the midline and closely opposed by surrounding white matter, including the tapetum and callosal fibers of the forceps major. Superiorly and medially, the contour of the posterior horn is read against the ventricular roof and medial wall, where the calcar avis may be appreciated as a separate elevation related to the calcarine sulcus. Boundaries matter here. This regional anatomy matters when interpreting posterior horn configuration on CT or MRI, because disproportionate dilation of the occipital horns (colpocephaly) and posterior periventricular volume loss can change the appearance of the bulb and adjacent ventricular margins in ways that mimic focal mass effect. Neurosurgical planning also benefits from a fixed medial view: approaches to the atrium or posterior horn for intraventricular tumor biopsy, catheter placement, or endoscopic inspection must respect the nearby optic radiation coursing in the lateral occipital and temporal periventricular white matter. The lighting and surface modeling in this illustration make the convexity of the bulb easier to separate from neighboring ventricular elevations that are often conflated in teaching diagrams. Neuroanatomy and neuroradiology courses can pair this illustration with sectional imaging to reinforce how callosal and occipital lobe architecture shapes the posterior ventricular cavity. Medical publishers and clinical educators will also find it well suited for chapters on the lateral ventricles, hydrocephalus patterns, and atrial or posterior horn procedures where precise terminology (occipital horn, atrium, bulb, calcar avis) prevents common labeling errors. Anatomical accuracy verified by SciePro's Medical Advisory Board.