Third ventricle
| Third ventricle | |
|---|---|
Blue - Lateral ventricles
Cyan - Interventricular foramina (Monro) Yellow - Third ventricle Red - Cerebral aqueduct (Sylvius) Purple - fourth ventricle Green - continuous with the central canal (Apertures to subarachnoid space are not visible) |
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| Details | |
| Identifiers | |
| Latin | ventriculus tertius cerebri |
| NeuroNames | hier-429 |
| NeuroLex ID | Third ventricle |
| Dorlands /Elsevier |
v_06/12853453 |
| TA | A14.1.08.410 |
| FMA | 78454 |
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Anatomical terms of neuroanatomy
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The third ventricle is one of four connected fluid-filled cavities comprising the ventricular system within the mammalian brain. It is a median cleft in the diencephalon between the two thalami, and is filled with cerebrospinal fluid (CSF).
It is in the midline, between the left and right lateral ventricles. Running through the third ventricle is the interthalamic adhesion, which contains thalamic neurons and fibers that may connect the two thalami.
The third ventricle communicates with the lateral ventricles anteriorly by the interventricular foramina (of Monro). It also communicates with the fourth ventricle posteriorly by the cerebral aqueduct (of Sylvius).
The third ventricle, like other parts of the ventricular system of the brain, develops from the central neural canal of the neural tube. Specifically, it originates from the portion of the tube that is present in the developing prosencephalon, and subsequently in the developing diencephalon.
The third ventricle is bounded by the thalamus and hypothalamus on both the left and right sides. The lamina terminalis forms the anterior wall. The floor is formed by hypothalamic structures. The roof is formed by the ependyma, lining the undersurface of the tela choroidea of the third ventricle.
There are two protrusions on the anterior aspect of the third ventricle:
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