PSYB64H3 Study Guide - Midterm Guide: Subthalamic Nucleus, Error Detection And Correction, Superior Colliculus

61 views13 pages
22 Jun 2012
School
Department
Course

Document Summary

Skin, then bone of skill (3 layers of membrane protect the brain: meninges) Outer most layer aka dura mater- leather like tissue that follow outlines of skull bones. Then, arachnoid layer- more delicate layer, looks like spider web. Innermost layer, aka pia mater- nearly transparent sticks closely to the outside of the brain (all cover the brain and spinal cord. Only dura and pia, cover exit, called the peripheral nervous system nerves. ) Cerebrospinal fluid (csf) circulates in the hollow spaces of brain aka ventricles. Produced by the choroid plexus- using nearby blood supply within ventricles. Csf circulates through central canal of spinal cord and 4 in brain. New csf made 3 times daily, old absorbed into blood at top of head. Never in direct contact with blood, but composition important for diagnosing diseases aka spinal tap (fluid from subarachnoid space) Hydrocephalus- water on the brain, bc of narrow sections in circulation system, occurs blockages.