FOURTH VENTRICLE
\fˈɔːθ vˈɛntɹɪkə͡l], \fˈɔːθ vˈɛntɹɪkəl], \f_ˈɔː_θ v_ˈɛ_n_t_ɹ_ɪ_k_əl]\
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By Princeton University
By DataStellar Co., Ltd
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An irregularly shaped cavity in the rhombencephalon, between the medulla oblongata, the pons, and the isthmus in front, and the cerebellum behind. It is continuous with the central canal of the cord below and with the CEREBRAL AQUEDUCT above, and through its lateral and median apertures it communicates with the subarachnoid space.
By DataStellar Co., Ltd
By Willam Alexander Newman Dorland
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A lozenge-shaped space bounded laterally above by the processus e cerebello ad testes and below by the posterior pyramids and the restiform bodies. Its floor is formed by the posterior surface of the pons Varolii and medulla oblongata, and its roof by the valve of Vieussens and the inferior surface of the cerebellum (a layer of the pia being interposed). It connects above with the aqueduct of Sylvius, and below with the central canal of the spinal cord.
By Smith Ely Jelliffe