Comparison between CV4 and EV4 - Osteopathic Research

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2.3.2 Function and tasks
The cerebrospinal fluid’s hydrodynamic cushioning buffer function gathers
forces occuring both inside and out, distributes them and thus acts as protection
for the brain and spinal cord. The liquor overwhelmingly takes over the
lymphatic and immunological function in the CNS as it is responsible for the
exchange of substances between blood and nervous tissues. The liquor also
feeds nerve cells and disposes of cell waste (brain kidney). Capillary endothel
cells and choroid plexus are a part of the blood-brain barrier that is responsible
for the selective substance exchange for the proper maintenance of biochemical
functions. The liquor also takes over the transportation of neurotransmitters as
well as hypothalamic- and neuro-hypophyseal substances.
2.3.3 External Liquor space
The subrachnoidal space filled with cerebrospinal fluid and located between the
arachnoid and the pia mater is a thin slit and extends only in certain areas to
cisterns. The liquor surrounds the spinal cord up to the 2 nd sacral vertebra in the
subarachnoidal space.
2.3.4 Internal Liquor space
The ventricular system consists of both semicircular lateral ventricles of the
cerebrum; the small third ventricle; as well as the fourth ventricle which extends
cone-pike between the pons, medulla and cerebellum.
Margit Grill / 2006