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Definition of Fourth ventricle
1. Noun. An irregular ventricle between the third ventricle and the central canal of the spinal cord.
Medical Definition of Fourth ventricle
1. A cavity of irregular tentlike shape extending from the obex rostralward to its communication with the sylvian aqueduct, enclosed between the cerebellum dorsally and the rhombencephalic tegmentum ventrally, having a rhomboid-shaped floor (rhomboid fossa) and a tentlike roof which in its caudal part is formed by the tela choroidea and the posterior medullary velum, in its middle part by the white matter of the cerebellum, and in its narrowing rostral part (recessus superior) by the anterior medullary velum. The fourth ventricle reaches its greatest width at the pontomedullary transition, where it expands laterally behind the cerebellar peduncles into the spoutlike lateral recess, and its greatest height at the fastigial recess, which reaches up into the cerebellar white matter. Direct communication of the brain's ventricle system and the subarachnoid space is established at the level of the fourth ventricle by a median opening in the tela choroidea, the medial aperture of Magendie's foramen, which opens into the cerebellomedullary cistern, and on both sides by the lateral aperture or foramen of Luschka, which connects the lateral recess with the interpeduncular cistern. Synonym: ventriculus quartus, ventricle of rhombencephalon. (05 Mar 2000)
Lexicographical Neighbors of Fourth Ventricle
Literary usage of Fourth ventricle
Below you will find example usage of this term as found in modern and/or classical literature:
1. Anatomy, Descriptive and Surgical: Descriptive and Surgical by Henry Gray (1897)
"Floor of the fourth ventricle (Fig. 423). As already stated, the floor of the
fourth ventricle is made up of the mesial portions of the dorsal surfaces of, ..."
2. Anatomy, Descriptive and Surgical by Henry Gray (1901)
"The fourth ventricle is lozenge- or diamond-shaped ; that is to say, ... The roof
of the fourth ventricle is formed from above downward by the following ..."
3. The Anatomy of the Nervous System from the Standpoint of Development and by Stephen Walter Ranson (1920)
"The posterior surface of the pons forms the rostral part of the floor of the
fourth ventricle, along the lateral borders of which there are two prominent ..."
4. Quain's Elements of Anatomy by Jones Quain, Edward Albert Sharpey-Schäfer, George Dancer Thane, Johnson Symington (1893)
"The fourth, ventricle.—The external characters of the medulla oblongata and pons
may be completed by a description of those parts which enter into the ..."
5. Anatomy, Descriptive and Applied by Henry Gray (1913)
"In the roof of the fourth ventricle there are three openings, a medial and two
... The anterior part of the fourth ventricle is named, from its shape, ..."
6. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1881)
"When the extravasation first appears in the fourth ventricle, it generally passes
upwards through the iter, but it also sometimes ..."
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