Ventricle (plural: ventricles) is a general term that refers to an anatomic cavity within an organ.
Ventricles are located in the:
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brain:
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heart:
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larynx:
laryngeal ventricle (not to be confused with the vestibule)
The term fifth ventricle is also used which has it's own disambiguation:
cavum septum pellucidum (variant) in the brain
ventriculus terminalis in the spine
History and etymology
Ventricle derives from the Latin word ventriculus, for small belly or cavity.