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The third ventricle is one of the four connected cerebral ventricles of the ventricular system within the mammalian brain. It is a slit-like cavity formed in the diencephalon between the two thalami , in the midline between the right and left lateral ventricles , and is filled with cerebrospinal fluid (CSF).
This is an extremely serious condition regardless of the cause of blockage. An endoscopic third ventriculostomy is a surgical procedure for the treatment of hydrocephalus in which an opening is created in the floor of the third ventricle using an endoscope placed within the ventricular system through a burr hole.
Rostrally, it is continuous with the third ventricle, commencing just inferior to the posterior commissure. [3] Caudally, it is continuous with the fourth ventricle at the junction of the mesencephalon and pons. [3] The midbrain tegmentum is situated anteriorly to the cerebral aqueduct. [3]
Brain at the U.S. National Library of Medicine Medical Subject Headings (MeSH) (view tree for regions of the brain) BrainMaps.org; BrainInfo (University of Washington) "Brain Anatomy and How the Brain Works". Johns Hopkins Medicine. 14 July 2021. "Brain Map". Queensland Health. 12 July 2022.
Stained brain slice images which include the "putamen" at the BrainMaps project "Anatomy diagram: 13048.000-2". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2012-07-22. Diagram at uni-tuebingen.de; Atlas image: eye_38 at the University of Michigan Health System – "The Visual Pathway from Below"
Images showing an enlarged third ventricle along with a normally sized fourth ventricle (in a lateral view) is generally considered to be an indication of aqueductal stenosis, but this is still only presumption. [2] [3] CT scans are typically used after a shunt treatment in order to analyze ventricle size and determine if the device is working ...
Human supraoptic nucleus (SON, dorsolateral and ventromedial components) in this coronal section is indicated by the shaded areas. Dots represent vasopressin (AVP) neurons (also seen in the paraventricular nucleus, PVN). The medial surface is the 3rd ventricle (3V), with more lateral to the left.
The vascular organ of lamina terminalis (VOLT), organum vasculosum of the lamina terminalis (OVLT), or supraoptic crest [1] is a sensory organ, one of the circumventricular organs of the third ventricle within the lamina terminalis. It is covered with pia mater, and lined with ependyma.