What is cerebral spinal fluid

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Reference no: EM133979506

Assignment:

1) Based on the video below, explain what cerebral spinal fluid (CSF) is, how it is made (structures involved); and discuss its complete circulation

2) Based on the video below, explain what the resting membrane potential is and its value. Please include all structures involved in the creation and maintenance of the resting membrane potential.

Answer Guide for Resting Membrane Potential

• The RMP is created by the activity of Leaky Sodium Ion Channels

• The RMP is created by the activity of Leaky Potassium Channels

• The leaky potassium channels cause potassium ions to leak out of the cell, making the inside more negative, causing the membrane potential to have a -90mV value

• The leaky sodium channels cause sodium ions to leak into the cell, making the inside is more positive to a value of -70mV which is the value of the RMP

• The RMP is the difference in charge across the plasma membrane in which the inside is more negative and the outside is more positive, and is valued at -70mV

• The RMP is maintained by the activity of the Sodium/Potassium Pump which pumps out 3 sodium ions for every 2 potassium ions it pumps in.

Answer Guide for CSF

• Defining the CSF: Watery liquid, nutrients, waste, buoyancy, circulates to brain and spinal cord

• The CSF is produced by the choroid plexus

• The Lateral, 3rd and 4th ventricles and their correct placement in the CSF

Flow

• Discussing the Interventricular foramen

• Discussing the cerebral aqueduct

• Discussing the Lateral Aperture

• Discussing the median aperture

• Discussing the flow of CSF into the Central Canal of the Spinal Cord

• Discussing the Subarachnoid space

• Discussing that the CSF washes over the surface of the brain and spinal cord after entering the subarachnoid space

• Discussing the arachnoid villi

• Discussing the dural sinuses

• The CSF flows into the veins from the dural sinuses to be returned to the circulator system via the veins

Reference no: EM133979506

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