III Cerebrospinal Fluid Story (please complete) a) Cerebrospinal fluid is formed by capillary knots called ________, which hang into the ________ of the brain. Ordinarily, cerebrospinal fluid flows from the lateral ventricles to the third ventricle and then through the ________ to the fourth ventricle. Some of the fluid continues down the ________ of the spinal cord, but most of it circulates into the ________ by passing through three tiny openings in the walls of the ________. As a rule, cerebrospinal fluid is formed and drained back into the venous blood at the same rate. If its drainage is blocked, a condition called hydrocephalus occurs, which results in increased pressure on the brain. b) Write a story ...Trace a drop of CSF from a lateral ventricle to reabsorption at an arachnoid granulation (Fig. 14-4 and p. 454 of the assigned text are very helpful)
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This drop of fluid flowed from the lateral ventricle to the third ventricle through the interventricular foramen. As it continued its journey, the drop of cerebrospinal fluid passed through the cerebral aqueduct and into the fourth ventricle. From there, some of Show more…
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Choroid plexus in the fourth ventricle adds more CSF. CSF fills the subarachnoid space and bathes external surfaces of brain and spinal cord. CSF is secreted into each lateral ventricle by choroid plexus and flows into the third ventricle where more is added. At arachnoid villi, CSF is reabsorbed into venous blood of dural venous sinuses. CSF then flows down the cerebral aqueduct to the fourth ventricle. CSF then flows out two lateral apertures and one median aperture.
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CSF formation • site where CSF is formed is called - (network of capillaries in all four walls of ventricles) • the capillaries contain ependymal cells that make CSF (made from filtered blood plasma) These tightly wedge cells make up the - only allowing specific substances to enter the CSF. CSF Circulation Flows from lateral ventricle into the Then moves through the cerebral aqueduct which passes through the midbrain and into the from here it flows into the and CSF is reabsorbed by at same rate it is formed therefore pressure stays constant. 480 ml circulate in the body each
Cerebrospinal fluid fills the space between the dural sheath and dura mater, dural sheath and vertebral bones, arachnoid mater and pia mater, dura mater and pia mater. Motor commands are carried by both anterior and posterior roots, ascending tracts, spinal nerves, cranial nerves, descending tracts from the brain to the spinal cord. Nerve fibers are insulated from one another by perineurium, endoneurium, fascicles, connective tissue, blood vessels. A ganglion is a cluster of neurosomas in the PNS, while dendrites cluster in the CNS. The anterior rami of the spinal nerves form nerve plexuses in all regions except the thoracic region, including the cervical, lumbar, and sacral regions. Which of the following is an ascending tract of the spinal cord? Lateral tectospinal tract, Medial reticulospinal tract, Ventral corticospinal tract, Vestibulospinal tract, Gracile fasciculus.
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