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Why is a spinal reflex more rapid than a voluntary movement?
AnswerBecause a reflex action is automatic and does not involve a thought process.Edit: A reflex action only has to go to the spinal cord and then back to the limb, whereas a voluntary reaction has to go to the brain to be processed and therefore takes longer.
Why does each vertebra have a hole that goes through it?
The hole in each vertebra forms the vertebral foramen through which the spinal cord passes. This structure provides protection and support for the spinal cord while allowing for nerves to branch out from the spinal cord to different parts of the body.
The simplest level of CNS function is the?
The simplest level of CNS function is the reflex arc. It involves a sensory neuron detecting a stimulus and sending a signal to the spinal cord, which then immediately sends a signal back through a motor neuron to produce a response, without involving the brain.
What passes through the foramen magnum?
The mandibular nerve passes through foaramen ovale of the spenoid bone. Blood passes through the foamen ovale of the heart of the fetus.
Where is the signal to transferred to the association nerve cells?
The signal comes from the brain, down the spinal cord, and down to the nerve cells that need to send the stimulus signal. The signal also runs vice versa, up the spinal cord and into the brain.
Where does motor impulse travel through spinal cord?
ascending tracts
What is the difference between ascending tracts and descending tracts of the spinal cord?
ascending carry sensory information toward the brain.descending convey motor command to the spinal cord.
How does information travel from the brain to the lower extremities?
Information travels from the brain to the lower extremities through use of the peripheral nervous system. A signal is sent from the brain through the spinal cord and into muscles of the trunk.
Ascending pathways in the spinal cord convey what?
Sensory information
Why do messages not get mixed up passing through the spinal cord?
There are ascending and descending tracts in the spinal cord. These tracts are nerve fibers bundled together. Messages going to the brain pass through the ascending tracts while messages coming from the brain pass through the descending tracts. These separate paths prevent messages from getting mixed up.
How is a nerve signal transmitted from the point of sense to the brain and back?
When a stimulus is detected by a sensory nerve ending, it creates an electrical signal that travels along the nerve fiber to the spinal cord or brain. In the brain, the signal is processed, and a response is generated. The response signal then travels back along motor nerves to the muscles or organs to carry out the appropriate action.
Where does the nerve impulse travel from the reflex arc?
The nerve impulse typically travels from the sensory neuron to the spinal cord, where it is processed by interneurons, and then to the motor neuron to elicit a response from the effector organ or muscle.
Which of the following is not an ascending spinal cord nerve fiber tract?
reticulospinal
What are the neurons that conduct the nerve impulses from the spinal cord and the brainstem to the thalamus called?
afferent nerves of the ascending spinal pathways.
Why is a spinal reflex more rapid than a voluntary movement?
AnswerBecause a reflex action is automatic and does not involve a thought process.Edit: A reflex action only has to go to the spinal cord and then back to the limb, whereas a voluntary reaction has to go to the brain to be processed and therefore takes longer.
In the spinal cord white matter is separated into ascending and descending tracts organized as?
columns
What is a signal that is sent from the brain and goes down?
A signal that is sent from the brain and travels down is typically a motor command. These signals originate in the motor cortex, where they initiate voluntary movements by sending electrical impulses through the spinal cord to peripheral nerves. This process enables communication between the brain and muscles, allowing for coordinated actions.
