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Anatomy of the Brain: Ventricles

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There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen. The...

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Updated: Jun 4, 2026

Exploring Deep Space - Uncovering the Anatomy of Periventricular Structures to Reveal the Lateral Ventricles of the Human Brain

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Published on: October 22, 2017

Extraventricular corpus callosotomy.

Jacob R Joseph¹, Ashwin Viswanathan, Daniel Yoshor

¹Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030, USA.

Journal of Neurosurgery

|February 22, 2011

Summary

This summary is machine-generated.

Corpus callosotomy can effectively palliate intractable seizures, especially drop attacks. This technique enables complete callosum sectioning by utilizing the septum pellucidum cleft, avoiding lateral ventricle entry.

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Area of Science:

Neurosurgery
Epilepsy Surgery

Background:

Medically intractable seizures, particularly drop attacks, significantly impact patient quality of life.
Corpus callosotomy is a palliative surgical option for select epilepsy patients.

Purpose of the Study:

To present a novel technique for corpus callosotomy.
To achieve complete sectioning of the corpus callosum while avoiding lateral ventricle entry.

Main Methods:

The technique leverages a midline cleft ventral to the corpus callosum, formed by the septum pellucidum laminae fusion.
This cleft is often present even without a cavum septum pellucidum on MRI.
The corpus callosum body is divided by exploiting this midline cleft.

Main Results:

The described method allows for complete corpus callosotomy.
Crucially, the technique avoids inadvertent entry into the lateral ventricles.
The procedure is characterized as simple and expeditious.

Conclusions:

Utilizing the septum pellucidum cleft offers a safe and efficient approach to corpus callosotomy.
This technique provides a valuable method for epilepsy surgery, minimizing risks associated with ventricular entry.