八、脑脊液及其循环 Eight, cerebrospinal fluid and circulation
脑脊液是一种无色透明的液体，充满脑室和蛛网膜下隙，成人约100~140ml。 Cerebrospinal fluid is a clear, colorless liquid, filled ventricles and subarachnoid space, an adult about 100 ~ 140ml.
（一）产生部位 (A) producing site
脑脊液产生于各脑室脉络丛。 Cerebrospinal fluid produced in each ventricle choroid plexus.
（二）循环途径 (B) the cycle route
左、右侧脑室脉络丛 — 经室间孔 →第三脑室 — 经中脑水管 →第四脑室 — 经正中孔、外侧孔 →蛛网膜下隙→蛛网膜粒→上矢状窦→窦汇→左右横窦→左右乙状窦→颈内静脉。 Left and right lateral ventricle choroid plexus - between the third ventricle through the foramen → - through the cerebral aqueduct → fourth ventricle - by the middle of the hole, lateral sinus sink hole sagittal sinus → → → → subarachnoid subarachnoid on grain → left transverse sinus → around within the sigmoid sinus → jugular vein.
（三）作用 (C) the role of
保护脑和脊髓，维持颅内压，参与脑和脊髓的代谢。 Protect the brain and spinal cord, maintain intracranial pressure, involved in the metabolism of the brain and spinal cord.