third ventricle

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Related to third ventricles: ventricles of the brain, Ventricular system

ventricle

 [ven´trĭ-k'l]
a small cavity or chamber, as in the brain or heart.
ventricle of Arantius
1. the rhomboid fossa, especially its lower end.
fourth ventricle a median cavity in the hindbrain, containing cerebrospinal fluid.
ventricle of larynx the space between the true and false vocal cords.
lateral ventricle the cavity in each cerebral hemisphere, derived from the cavity of the embryonic tube, containing cerebrospinal fluid.
left ventricle the lower chamber of the left side of the heart, which pumps oxygenated blood out through the aorta to all the tissues of the body.
Morgagni's ventricle ventricle of larynx.
pineal ventricle an extension of the third ventricle into the stalk of the pineal body.
right ventricle the lower chamber of the right side of the heart, which pumps venous blood through the pulmonary trunk and arteries to the capillaries of the lung.
third ventricle a narrow cleft below the corpus callosum, within the diencephalon between the two thalami.

third ven·tri·cle

[TA]
a narrow, vertically oriented, irregularly quadrilateral cavity in the midplane, extending from the lamina terminalis to the rostral opening of the mesencephalic aqueduct. This ventricle communicates at its rostrodorsal corner with each of the two lateral ventricles through the left and right interventricular foramen of Monro. Its narrow roof is formed by the tela choroidea that is attached on either side to the tenia thalami; its lateral wall is formed by the medial surface of the thalamus and, below the hypothalamic sulcus, by the hypothalamus, which also forms its floor. In lateral profile, the third ventricle exhibits a number of recesses: in its floor, from rostral to caudal, 1) the supraoptic recess in the acute angle between the base of the lamina terminalis and the dorsum of the optic chiasm, 2) the infundibular recess extending ventrally into the infundibulum but (in humans) not into the hypophysial stalk, and 3) the mammillary or inframammillary recess caused by the protrusion of the mammillary bodies into the ventricle. From its posterocaudal corner, the pineal and suprapineal recesses extend caudally in relation to the pineal gland.

third ven·tri·cle

(thĭrd ven'tri-kĕl) [TA]
A narrow, vertically oriented, irregularly quadrilateral cavity in the midplane, extending from the lamina terminalis to the rostral opening of the mesencephalic aqueduct. This ventricle communicates at its rostrodorsal corner with each of the two lateral ventricles through the left and right interventricular foramina of Monro. Its narrow roof is formed by the tela choroidea, which is attached on either side to the tenia thalami; its lateral wall by the medial surface of the thalamus and, below the hypothalamic sulcus, by the hypothalamus, which also forms its floor.
Synonym(s): ventriculus tertius [TA] .

third ventricle

The small, slit-like midline, fluid-filled space in the centre of the brain which communicates with the two large lateral ventricles, one in each hemisphere, and with the FOURTH VENTRICLE behind.
References in periodicals archive ?
(c) Transplanted NSC-Shh cell distribution within the lateral ventricles and third ventricle. (d) Proportion of transplanted NSC-Shh cells that exhibited expression of mG, indicating in vivo Shh expression.
(g- l) NSC-GFP cells transplanted into the lateral ventricle (LV) nestled within the choroid plexus (g) or adhered to the walls of the lateral ventricles (h, i) and were also found within the third ventricle (j).
Gott, "Transcallosal, interfornical approaches for lesions affecting the third ventricle: surgical considerations and consequences," Neurosurgery, vol.
Cranial magnetic resonance imaging (MRI) revealed a tumor in the third ventricle and one in the fourth ventricle.
M's CT scan revealed dilation of both lateral ventricles and the third ventricle, with sparing of the fourth ventricle, findings commonly associated with INPH.
As a consequence of mass effect, the right lateral ventricle was completely collapsed, and the midline structures, including the third ventricle, were displaced from right to left.
The ventricular system was partially collapsed, but there was no deviation of the septum pellucidum or third ventricle. Microscopic sections revealed a malignant glioma.
Examination of the brain revealed only enlarged lateral and third ventricles.
Chordoid glioma: a neoplasm unique to the hypothalamus and anterior third ventricle. AJNR Am J Neuroradiol 2001 Mar;22(3):464-469.
Renal third ventricle tissue showed diffuse compression, malignant lymphomas pituitary gland with regional normal.
(4) Finally, the large majority of cases of endoscopic resection of intraventricular tumors in the literature describe tumors in the region of the third ventricle. The majority of intraventricular tumors, however, are discovered in the body or frontal horn of the lateral ventricle, followed by the atrium, and finally, the foramen of Monro and third ventricle [80, 81, 85].
Stenosis results in lateral and third ventricle hydrocephalus; the fourth ventricle remains normal in volume (Figure 11).