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Sponge: Set up Cornell Notes on pg. 17 Topic: 11.2: Ventricles and Cerebrospinal Fluid

11.2: Ventricles and Cerebrospinal Fluid. 2.1 Atoms, Ions, and Molecules. Sponge: Set up Cornell Notes on pg. 17 Topic: 11.2: Ventricles and Cerebrospinal Fluid Essential Question : On pg. 16, draw a picture that shows the pattern of CSF circulation Must have COLOR.

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Sponge: Set up Cornell Notes on pg. 17 Topic: 11.2: Ventricles and Cerebrospinal Fluid

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  1. 11.2: Ventricles and Cerebrospinal Fluid 2.1 Atoms, Ions, and Molecules Sponge: Set up Cornell Notes on pg. 17 Topic: 11.2: Ventricles and Cerebrospinal Fluid Essential Question: • On pg. 16, draw a picture that shows the pattern of CSF circulation Must have COLOR ESSAYS due TOMORROW!!!!!

  2. Ventricles: • Located within the cerebral hemispheres and brainstem • Interconnected cavities filled with cerebrospinal fluid • Lateral ventricles- 2 large ventricles in the right and left cerebral hemispheres • Third ventricle- midline of the brain • Fourth ventricle- in the brainstem • cerebral aqueduct- lead to subarachnoid space in the meninges

  3. Cerebrospinal fluid: • Secreted by choroid plexus • Circulates in ventricles, central canal of spinal cord, and subarachnoid space • Clear liquid that completely surrounds brain and spinal cord • Provides nutrition (sodium, glucose, potassium) • Provides a pathway to blood for waste • Helps maintain stable ion concentrations in CNS • Protects the brain and spinal cord by absorbing forces that might otherwise jar and damage their delicate tissues

  4. Impact from car crash Shaken Baby Syndrome

  5. Concussion Latin: “To shake violently”

  6. Concussion Videos • Concussion-Helmets • Impact of a concussion

  7. Humans secrete nearly 500 milliliters of cerebrospinal fluid daily • However only about 140 milliliters are in the n.s. at any time because it is continuously reabsorbed into the blood • CSF is reabsorbed through the arachnoid granulations

  8. P. 389 in book Pg. 16 Draw/label/ Provide Arrows!!! Highlight/color Cerebrospinal fluid path

  9. Turn in ESSAYS • If you have a hard copy, please take it out • Take out your direction sheet (name/period)

  10. Spinal tap: Measures CSF pressure • A needle is inserted into the subarachnoid space in the lumbar vertebrae • Samples of CSF maybe withdrawn and tested for abnormal results • A temporary drain, called a shunt, may be inserted to relieve pressure

  11. Brain Injury Video 5m

  12. Clinical Application 11.1 What are three things that can increase CSF pressure within the ventricles? Summarize the steps (4) of how a spinal tap is performed. What is the purpose of a shunt? Why would an infant need a shunt?

  13. Clinical Application 11.1 • What are three things that can increase CSF pressure within the ventricles? • An infection • A tumor • A blood clot • 2. Summarize the steps (4) of how a spinal tap is performed. • A doctor inserts a hollow needle into the subarachnoid space • A manometer measures the pressure of the CSF fluid • CSF tested for abnormal constituents (ex: red blood cells can indicate a hemorrhage in the CNS) • A temporary drains is inserted to relieve pressure • 3. What is the purpose of a shunt? • Drains fluid away from the cranial cavity and into the digestive tract where it can be reabsorbed into the blood • 4. Why would an infant need a shunt? • The cranial sutures have not yet united- increasing pressure (ICP) may enlarge cranium -“Water on the brain”

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