Definition of Third ventricle

1. Noun. A narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueduct.

Generic synonyms: Ventricle

Medical Definition of Third ventricle

1. 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 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. In lateral profile, the third ventricle exhibits a number of recesses: in its floor, from before backward, 1) the preoptic 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 mamillary or inframamillary recess caused by the protrusion of the mamillary bodies into the ventricle. From its dorsocaudal corner, the pineal recess extends caudally into the pineal stalk. Synonym: ventriculus tertius, diacele, ventricle of diencephalon. (05 Mar 2000)

Lexicographical Neighbors of Third Ventricle

third peroneal muscle
third person
third power
third rail
Third Reich
third sacker
third sound
third stage of labour
third stomach
third temporal convolution
third tonsil
third tonsil
third trimester
third trochanter
third ventricle (current term)
third ventricle (current term)
third ventriculostomy
Third World
thirl
thirlage
thirlages
thirled
thirling
thirls
thirst
thirst
thirsted
thirster
thirsters
thirstier

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