Third_ventricle, Third_ventricle Information, Third


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Brain: Third ventricle

Scheme showing relations of the ventricles to the surface of the brain.
Latin	ventriculus tertius cerebri
NeuroNames	hier-429
Dorlands/Elsevier	v_06/12853453

The third ventricle (ventriculus tertius) is one of four connected fluid-filled cavities comprising the ventricular system within the human brain. It is a median cleft between the two thalami, and is filled with cerebrospinal fluid (CSF).

It is in the midline, between the left and right lateral ventricles.

Communication

It communicates with the lateral ventricles anteriorly by the interventricular foramina (of Monro).

It communicates with the fourth ventricle posteriorly by the cerebral aqueduct (of Sylvius).

Development

Developmentally the third ventricle represents the cavity of the diencephalon.

Boundaries

It is bounded by the thalamus and hypothalamus on both the left and right sides. The lamina terminalis forms the anterior wall of the third ventricle.

Protrusions

There are two protrusions on the front of the third ventricle:

the supra-optic recess (above the optic chiasma)
the infundibular recess (above the pituitary stalk).

In casts of the ventricular system, a small \'hole\' may be seen in the body of the third ventricle. This is formed where the two thalami are joined together at the interthalamic adhesion (not seen in all people).

Additional images

Gray717.png

Coronal section of brain immediately in front of pons.

Gray718.png

Coronal section of brain through intermediate mass of third ventricle.

Gray723.png

Coronal section of lateral and third ventricles.

Gray735.png

Drawing of a cast of the ventricular cavities, viewed from above.

Gray744.png

Coronal section of brain through anterior commissure.

Gray768.png

Diagram showing the positions of the three principal subarachnoid cisternæ.

Gray1181.png

Median sagittal through the hypophysis of an adult monkey. Semidiagrammatic.

External links

BrainMaps at UCDavis third%20ventricle

v • d • e

Brain: diencephalon

Epithalamus

Pineal body • Habenula (Habenular nuclei)

Hypothalamus

anterior	Anterior hypothalamic nucleus • Paraventricular nucleus • Preoptic area • Supraoptic nucleus • Suprachiasmatic nucleus
intermediate/middle/ tuberal/pituitary	infundibulum • median eminence • arcuate nucleus • Ventromedial nucleus • Dorsomedial hypothalamic nucleus • Tuber cinereum, Pituitary gland (Anterior pituitary, Posterior pituitary)
posterior/lateral	posterior nucleus • Mammillary body • Lateral nucleus
other	Medial forebrain bundle

Subthalamus

Subthalamic nucleus • Zona incerta • Thalamic fasciculus • Lenticular fasciculus

Thalamus/nuclei

Ventral nuclear group (VA/VL, VP/VPM/VPL) • MD • AN • LNG (Pulvinar) • Intralaminar nucleus (Centromedian nucleus) • Midline nuclear group • Thalamic reticular nucleus • Metathalamus (MG, LG) • Interthalamic adhesion

Third ventricle

recesses: (Optic recess, Infundibular recess, Suprapineal recess, Pineal recess) • Hypothalamic sulcus

Other

Interventricular foramina • Optic chiasm • Subfornical organ • Mammillothalamic tract

This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia

Third_ventricle

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