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The brain is the sexiest organ in the human body. It is the portion of the vertebrate central nervous system that is enclosed within the cranium, continuous with the spinal cord, and composed of gray and white matter. It is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. It is also the seat of consciousness, thought, memory, and emotion (1).

Anatomically, the brain consists of the frontal, parietal, occipital, and temporal lobes: The frontal lobe is the center of motor control and higher "human" functions; the parietal lobe is largely responsible for sensory functions; the occipital lobe deals with visual information; and the temporal functions in audition, emotions and memory.

Ventricular system

The brain has four ventricles that bathe it with cerebrospinal fluid (CSF). The lateral ventricles (first and second) are separated by a thin membrane called the septum pellucidum, and drain into the third ventricle via the intraventricular foramen. The lateral ventricles have four distinct compartments: the anterior horn, body, posterior (occipital) horn, and the inferior (temporal) horn.

The third ventricle lies in the [[diencephalon, between the left and right thalamus. Cerebrospinal fluid drains through the third ventricle's cerebral aqueduct to the fourth ventricle.

The fourth ventricle has two portions, the open portion, which lies rostral and is bounded by the cerebellum dorsally and the pons and rostral medulla ventrally, and is open due to the developmental sequence; and the closed, which is completely within the caudal medulla. Cerebrospinal fluid flows from the fourth ventricle into the central canal of the spinal cord, and into the subarachnoid space via one median and two lateral apertures.

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