PSYCH 3313 Lecture Notes - Lecture 2: Peripheral Nervous System, Cerebrospinal Fluid, Internal Carotid Artery

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Nervous systems overview: central nervous system (cns) Somatic (body) nervous system: skull / vertebrae, meninges, cerebrospinal fluid, blood supply, blood-brain barrier. The meninges: three layers of meninges provide protection. Fever, headache, neck pain/stiffness, photophobia: procedures: epidural and spinal tap. Cerebral ventricles and central canal of the spinal cord: four cerebral ventricles. Lateral, third, fourth and central: correlated with enlarged size in some neurodegenerative disorders, filled with cerebral spinal fluid (csf) Made by ependymal cells of choroid plexus (lines walls of cerebral ventricles) or cells subarachnoid space. 100 150 ml at a time, replenished 3 times per day. Similar composition to clear plasma of blood (but no proteins) Csf moves in a pulsatile manner throughout the csf system with nearly zero net flow. 2 lateral ventricles 3rd ventricle 4th ventricle central canal of the spinal cord. C. 6. b. at the base of the cerebellum, csf exits into the subarachnoid space and is reabsorbed by veins near the top of the head: hydrocephalus.

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