Ventricles' Interthalamic Adhesion In Side View

Description

Interthalamic adhesion (massa intermedia) spans the midline within the third ventricle in this lateral (side) view of the diencephalon. The right and left thalami form the superior and lateral walls of the third ventricle, and the adhesion appears as a narrow band crossing the ventricular cavity between them, positioned posterior to the interventricular foramen and superior to the hypothalamic region. Surrounding ventricular contours define the third ventricle’s slit-like profile, with the adhesion interrupting the otherwise CSF-filled space rather than forming a true commissural fiber tract. Neuroanatomists value the interthalamic adhesion because it is a common midline variant, absent in a substantial proportion of adults, and when present it can narrow the third ventricle and alter how the cavity reads on CT or MRI. Radiologists sometimes reference it when orienting to the thalamus and ventricular midline on lateral or parasagittal imaging, while neurosurgeons consider it during endoscopic approaches that traverse the ventricular system, where a midline band can obscure or crowd working space. No commissure here. The fixed side perspective makes the relationship between thalamic surfaces and the third ventricular cavity easy to interpret for teaching ventricular boundaries and diencephalic topography. Use this illustration in medical neuroscience and neuroanatomy courses when introducing the ventricles and diencephalon, or in radiology lectures contrasting normal variants with third ventricular distortion in obstructive hydrocephalus and mass effect. It also fits neurosurgical and neuroradiology publications discussing endoscopic third ventriculostomy planning and midline landmarks within the third ventricle. Anatomical accuracy verified by SciePro's Medical Advisory Board.