Medical Definition of fifth ventricle
: a cavity between the vertical lamina of the septum pellucidum that does not have a channel of communication with the other ventricles of the brain
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“Fifth ventricle.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/fifth%20ventricle. Accessed 11 Aug. 2022.
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