Textbook Question
The central nervous system is responsible for:
a. Integrative functions
b. Sensory functions
c. Motor functions
d. Both b and c are correct
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12. The Central Nervous System
Introduction to the Central Nervous System
Problem 9
Textbook Question
What structure forms cerebrospinal fluid? How does this occur?
Verified step by step guidance1
The structure responsible for forming cerebrospinal fluid (CSF) is the choroid plexus, which is located in the ventricles of the brain (primarily the lateral, third, and fourth ventricles).
The choroid plexus is composed of specialized ependymal cells and a network of capillaries. These ependymal cells are responsible for the production and secretion of CSF.
The process begins with blood plasma being filtered through the capillaries of the choroid plexus. This filtration is selective, allowing only certain components of the plasma to pass through.
The ependymal cells actively transport ions such as sodium (Na⁺) and chloride (Cl⁻) into the ventricular space. This creates an osmotic gradient, which draws water into the ventricles to form CSF.
The CSF is then circulated through the ventricles, the central canal of the spinal cord, and the subarachnoid space, providing cushioning, nutrient transport, and waste removal for the central nervous system.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cerebrospinal Fluid (CSF)
Cerebrospinal fluid (CSF) is a clear, colorless liquid that surrounds the brain and spinal cord, providing cushioning, protection, and nutrient transport. It plays a crucial role in maintaining intracranial pressure and removing waste products from the central nervous system.
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Choroid Plexus
The choroid plexus is a network of blood vessels and cells located in the ventricles of the brain that is responsible for the production of cerebrospinal fluid. It filters blood plasma to create CSF, which is then secreted into the ventricular system, contributing to the overall volume of CSF in the central nervous system.
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Ventricular System
The ventricular system consists of interconnected cavities within the brain, including the lateral, third, and fourth ventricles, where cerebrospinal fluid is produced and circulated. This system facilitates the flow of CSF throughout the brain and spinal cord, ensuring proper distribution and drainage.
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