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Central Nervous System (Major parts/functions of the spinal cord (Ventral…
Central Nervous System
Major functions
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Integrative function
It analyzes sensory information, it stores some aspects, and makes decisions regarding appropriate behaviors.
Layers of the meningers
Dura mater
The tough outermost layer of the brain enveloping the brain and the spinal cord. Meningitis-s inflammation of meminges. It is dense and irregular with many blood vessels and nerves. It is attached to the periosteum.
Arachnoid mater
Fine, delicate membrane, which surrounds the brain and spinal cord. It is situated between the dura and pia mater. Subdural space- fluid filled area between dura ad subarachnoid mater. It is spider web with collagen and elastic fibers. It is a thin membrane that lacks blood vessels.
Pia mater
Innermost membrane enveloping both the brain and spinal cord. It follows the spinal cord and the counters of the brain. The subarachnoid space which is an area between the arachnoid and pia matter It is filled with cerebrospinal fluid. It is almost a transparent layer that has nerves and blood vessels.
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Lobes and functions
Frontal
The forehead portion. The function is for language comprehension, this controls voluntary actions of specific muscles/groups on the other side.
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Parietal
The top sides. The function is to receive impulse for touch, temperature. This is located behind the central sulcus.
Spaces and ventricles
Third ventricle
One of four connected surrounded by cavities. It is located by two halves of the brain which sends/receives messages. It contains cerebrospinal fluid.
Fourth ventricle
Communicating network cavities filled with CSF fluid. It is located in the upper portion of the medulla.
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Cerebral aqueduct
This connects the third, fourth ventricle, and the cerebral spinal fluid flow.
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Action Potential
An action potential is caused when different ions cross the neuron membranes. With a strong enough impulse, it can cause Na+ to get rushed into the cell causing depolarization. If a strong enough depolarization occurs the threshold potential is reached and an impulse is sent down an axon. Then K+ is rushed out of the neuron after Na+ is rushed in.