| Brain: Third ventricle | ||
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| 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. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. NeuroNames is a system of nomenclature for the human and/or macaque Brain. Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group The ventricular system is a set of structures in the Brain continuous with the Central canal of the Spinal cord. The brain is the center of the Nervous system in animals All Vertebrates and the majority of Invertebrates have a brain It is a median cleft between the two thalami, and is filled with cerebrospinal fluid (CSF). The thalamus (from Greek θάλαμος = room chamber, IPA= /ˈθæləməs/ is a pair and symmetric part of the brain Cerebrospinal fluid ( CSF) Liquor cerebrospinalis, is a clear Bodily fluid that occupies the Subarachnoid space and the Ventricular system
It is in the midline, between the left and right lateral ventricles. The lateral ventricles are part of the Ventricular system of the Brain.
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Communication
It communicates with the lateral ventricles anteriorly by the interventricular foramina (of Monro). The lateral ventricles are part of the Ventricular system of the Brain. In the Brain, the interventricular foramina (or foramina of Monro) are channels that connect the paired Lateral ventricles with the Third ventricle
It communicates with the fourth ventricle posteriorly by the cerebral aqueduct (of Sylvius). The fourth ventricle is one of the four connected fluid-filled cavities within the human Brain. The mesencephalic duct, also known as the aqueductus mesencephali, aqueduct of Sylvius or the cerebral aqueduct, contains Cerebrospinal
Development
Developmentally the third ventricle represents the cavity of the diencephalon. The diencephalon (or interbrain is the region of the Brain that includes the Thalamus, Hypothalamus, Epithalamus, Prethalamus or
Boundaries
It is bounded by the thalamus and hypothalamus on both the left and right sides. The thalamus (from Greek θάλαμος = room chamber, IPA= /ˈθæləməs/ is a pair and symmetric part of the brain The hypothalamus links the Nervous system to the Endocrine system via the Pituitary gland (hypophysis The lamina terminalis forms the anterior wall of the third ventricle. The median portion of the wall of the Fore-brain vesicle consists of a thin Lamina, the lamina terminalis, which stretches from the Interventricular foramen
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). At the junction of the floor and anterior wall of the Third ventricle, immediately above the Optic chiasma, the ventricle presents a small angular recess or diverticulum the The optic chiasm ( Greek χίασμα "crossing" from the Greek χλαζειν 'to mark with an X' after the Greek letter ' Χ ' chi) is the The floor of the Third ventricle is prolonged downward as a funnel-shaped recess the infundibular recess, into the Infundibulum, and to the apex of the latter the The pituitary gland, or hypophysis, is an Endocrine gland about the size of a Pea.
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). The medial surface of the Thalamus constitutes the upper part of the lateral wall of the Third ventricle, and is connected to the corresponding surface of the opposite thalamus
See also
Additional images
 Coronal section of brain immediately in front of pons. The suprapineal recess is an anatomical structure in the Ventricular system of the Brain. |
 Coronal section of brain through intermediate mass of third ventricle. |
 Coronal section of lateral and third ventricles. |
 Drawing of a cast of the ventricular cavities, viewed from above. |
 Coronal section of brain through anterior commissure. |
 Diagram showing the positions of the three principal subarachnoid cisternæ. |
 Median sagittal through the hypophysis of an adult monkey. Semidiagrammatic. |
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