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    From surgery how long does viagra remain effective to interventional intensive care. Surg Endosc 1999;15:6–13. Management of acute pancreatitis. 33. Werner J, Feuerback S, Uhl W, et al. Gut 2001;44:466–26.

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    The choroid plexus can eliminate from the cerebrospinal fluid a variety of compounds introduced into the ventricles how long does viagra remain effective. From here, it flows through the cerebral aqueduct and into the fourth ventricle, another major site for cerebrospinal fluid production because the choroid plexus is also located there. This extrachoroidal source of cerebrospinal fluid enters the ventricular system through ependymal cells, the ciliated cuboidal epithelial cells that line the ventricles. Although the principal function how long does viagra remain effective of the choroid plexus is cerebrospinal fluid secretion, the plexus also has a reabsorptive function.

    Cerebrospinal Fluid Circulates Throughout the Ventricles and Subarachnoid Space Cerebrospinal fluid produced by the choroid plexus in the lateral ventricles (Figure 429) flows through the interventricular foramina and mixes with cerebrospinal P.79 P.150 fluid produced in the third ventricle. Total cerebrospinal fluid production by both sources is approximately 510 mL per day.

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