Definition

Noun: - A narrow, fluid-filled cavity located in the midline of the brain, beneath the corpus callosum. It is part of the ventricular system and connects to the fourth ventricle via the cerebral aqueduct (also known as the aqueduct of Sylvius).

Usage

The term "third ventricle" is used specifically in anatomical and medical contexts to describe this particular structure within the brain. - The cerebrospinal fluid circulates from the lateral ventricles into the third ventricle. - A blockage in the cerebral aqueduct can cause enlargement of the third ventricle.

Advanced Usage

• "to be dilated": Used to describe an enlarged third ventricle, often seen in imaging studies or associated with certain neurological conditions.
  • The MRI scan showed a dilated third ventricle, indicating possible hydrocephalus.

Variants and Related Words

• Ventricle (n): A general term for any of the system of communicating cavities in the brain that are filled with cerebrospinal fluid. The third ventricle is one of these.
• Ventricular system (n): The entire set of interconnected ventricles in the brain, including the lateral, third, and fourth ventricles.

Synonyms

• There are no direct common synonyms for this precise anatomical term. In technical descriptions, it may be referred to descriptively as the midline ventricle or the diencephalic ventricle.

Related Phrases

• "Obstruction of the third ventricle": A phrase describing a blockage that impedes cerebrospinal fluid flow through this cavity.
• "Floor of the third ventricle": Refers to the inferior anatomical boundary of this ventricle.

Related Idioms

• There are no common idioms that incorporate the specific term "third ventricle."

Noun

1. a narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueduct