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# Origin of CSF * Secreted from Choroid plexus (capillaries by Ependymal cells) in walls of the ventricles * Starts with blood vessels and ends with capillaries using Starling's law # Passage of CSF * _Ventricles_ * _Subarachnoid space_ * _Central canal_ * _Open space containing CSF_ # Reabsorpt...

# Origin of CSF * Secreted from Choroid plexus (capillaries by Ependymal cells) in walls of the ventricles * Starts with blood vessels and ends with capillaries using Starling's law # Passage of CSF * _Ventricles_ * _Subarachnoid space_ * _Central canal_ * _Open space containing CSF_ # Reabsorption of CSF * CSF returns to blood via arachnoid villi (grape-like clusters of arachnoid mater protruding into dural sinuses) * CSF drains to dural sinuses then to jugular veins # Brainstem * **Midbrain**: Superior most portion * **Pons**: Middle portion * **Medulla Oblongata**: Most inferior # Medulla Oblongata * Most important and inferior * Vital control center * Continuation of spinal cord * Contains: * Ascending and descending tracts * Pathways to/from cerebellum * Origin of 5 cranial nerves * Vital control centers: * Cardiovascular center (rate/force of heart & diameter blood vessels) * Direct blood flow to different areas * Respiratory center * Basic rhythm of breathing * Stimulates muscles for breathing * Control centers for coughing, sneezing, hiccuping, swallowing, vomiting, and sweating * Slightly less important, but still need to happen. # Pons * Bridge between medulla and midbrain * Centers that control pattern of breathing (works with the respiratory center) * Origin of 4 cranial nerves