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PATHWAY FOR CEREBROSPINAL
FLUID
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The nervous system is a hollow nerve cord
with cerebrospinal fluid flowing through the center. In vertebrate brains, this hollow center expands
to form a number of ventricles. In
humans, cerebrospinal fluid synthesized in choroid
plexus flows through lateral ventricles (in the cerebrum) to a third ventricle
(in the diencephalon) through a cerebral aqueduct
(through the midbrain) and into the fourth ventricle (at the base of the
cerebellum). From there the fluid
may flow into the central canal of the medulla and spinal cord or be reabsorbed
in the meninges.
This set of chambers is shared with other vertebrates. In lower vertebrates, there is also a ventricle
in the midbrain. |
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SHARK |
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LUNGFISH |
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ALLIGATOR |
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OPOSSUM |
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SHEEP PIG |
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HUMAN |
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