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SUMMARY:8.2 Other Structures
DTSTART;TZID=America/Los_Angeles:20260409T190000
DTEND;TZID=America/Los_Angeles:20260409T200000
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DESCRIPTION: The spinal cord:
The spinal cord extends from the medulla oblongata to the lumbar vertebrae. There are 31 pairs of spinal nerves both motor and sensory. The spinal cord also serves as a reflex center.
The nerve cells:
The nerve fibers outside the central nervous system in the peripheral nervous system are covered with a myelin sheath. An outer thinner covering over this myelin sheath is called neurilemma. The presence of the myelin sheath allows the nerve fiber to regenerate. This is a slow process. Nerve tissue in the brain and spinal cord has no myelin sheath and do not regenerate.
Meninges:
Three membranes comprise the meninges. The dura mater is a thick tough membrane lining the skull. The pia mater is a thin tissue covering the outermost layer of the brain. The arachnoid mater lies between the two; it is a thin covering and contains the blood vessels. this forms a protective covering around the brain
Cerebrospinal fluid:
The cerebrospinal fluid is produced by the choroid...

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