The collection of cerebrospinal fluid is generally obtained through lumbar puncture. Is there cerebrospinal fluid in all parts of the spine?

From what I've learned, where there is a spinal cord and a brain under physiological conditions, there is cerebrospinal fluid. But not all segments of the spine have the presence of the spinal cord. Cerebrospinal fluid is in a dynamic equilibrium. The choroid plexus of the brain produces cerebrospinal fluid, and the cerebrospinal fluid enters the venous system through a series of flows, so it is secreted and absorbed at the same time. The cerebrospinal fluid is not closed, it will enter the venous system, so metabolic waste can enter the blood of the veins through the cerebrospinal fluid,

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