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24 Cards in this Set

  • Front
  • Back
What ar eassociation tracts?
-they connect one part of a hemisphere to another part of the same hemisphere
What are commissural tracts?
-connect one hemisphere to the other
What are projection tracts?
-connects upper and lower parts of brain
What is decussation and where is it located?
-crossing over of nerve fibers from one side of body to opposite
-in medulla
What are the pons and medulla?
-relay center for incoming and outgoing impulses.
What does the primary somatosensory cortex do, located, and what important aspects does it include?
-receives sensory impulses from entire body
-usues post-central gyrus in parietal lobe
-first 40% includes the head
-the lips is the most sensitive part of body
-trunk has small portion of brain
Where is the primary motor cortex located and what does it include?
-uses pre-central gyrus in frontal lobe
-first 60% is head and hands
-genitals have no motor area (controlled by blood)
What does the meningres do and where is it located?
-protects the brain and under bone
What is duramater and its location?
-2 layers of dense irregular connective tissue (meningeal and periostal layers)
-on top of head which separates to form dural sinus
Where is the arachnoid located and what does it contain?
-internal in duramater
-contains sub arachnoid space which is filled with CSF
What is the pia mater and where is it located?
-highly vascular
-inferior to arachnoid
What is the subdural space?
-potential space that only exists in a diseased or dead brain
What is the falx cerebri?
-longitudinal fissure from menigis in cerebrum
What is the falx cerebelli?
-fissure from menigis in cerebellum
What does the arachnoid villi do?
-goes into blood to take nutrients into brain and remove waste from CSF
What are the 4 ventricles and how are they connected?
-2 lateral ventricles ---->connected to
-third ventricle ---by interventricular foramen
-fourth ventricle- runs down spinal cord and connected to third ventricle by mesencephalic aqueduct
What are ventricles?
-hollow spaces in brain filled with CSF
Where is CSF produced?
-produced in choroid plexus (in corpus callosum)
-materials retreved from blood and taken in by epidymal cells
What is the flow of CSF?
-enters thrid ventricle from choroid plexus
-goes down aqueduct to fourth ventricle
-goes through aperture to subarachnoid space and circulated around brain and spinal cord
-then flows into dural sinus
What is the function of CSF?
-to cushon brain and reduce impace (shock absorber)
-removes metabolic waste by transferring to blood
-gets nutrients from blood
What is meningitis?
-inflammation of meninges
-can be either viral or bacterial
How does a virus cause meningitis?
-a given virus has a primary target tissue
-seeks out certain tissues
-once in cell, it forces cell to replicate virus
How does a bacteria cause meningitis?
-produces toxins
-bacterial metabolic waste toxic to certain cells
What is the end result of meningitis?
-causes cell death
-death of menigeal cells weakens BBB
-inflamitory response triggers swelling inward
-can be fatal