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The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma. The ventricular system is composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct, and the fourth ventricle (see the following images).
A thin-walled blood vessel that returns blood toward the heart from the venules. myocardium. middle and largest layer of the heart wall, composed of cardiac muscle. ventricles. A general term for a cavity in the heart, one of the two chambers that receives blood from an atrium and pumps it into an artery.