Parts, Boundaries, and Features of the Third, Fourth, and Lateral Ventricles

Key Features and Functional Significance of the Third Ventricle

The third ventricle is a midline structure of the brain, situated between the two halves of the thalamus. It plays a crucial role in the circulation of cerebrospinal fluid (CSF) and integrates neuroendocrine functions.

Anatomical Boundaries

• Roof: Formed by the tela choroidea and the choroid plexus.
• Floor: Includes structures such as the hypothalamus and mammillary bodies.
• Lateral walls: Composed of the thalamus and hypothalamus.
• Anterior boundary: Consists of the lamina terminalis.
• Posterior boundary: Defined by the pineal gland and habenular commissure.

Physiological Role

The third ventricle facilitates CSF flow, supports neuroendocrine signaling, and plays a role in maintaining homeostasis. Its connectivity to the fourth ventricle via the cerebral aqueduct is crucial for CSF circulation.