Table of Contents
- 1 Where in the brain do the impulses first arrive?
- 2 In what order does a nerve impulse travel?
- 3 How fast does nerve impulse travel?
- 4 Which has the highest speed of nerve impulse?
- 5 Where are the neural pathways located in the spinal cord?
- 6 Where does the lateral spinothalamic tract travel in the spinal cord?
Where in the brain do the impulses first arrive?
Thalamus: The thalamus is the relay center of the brain. It receives afferent impulses from sensory receptors located throughout the body and processes the information for distribution to the appropriate cortical area.
Where do nerve impulses travel to the brain?
Sensory neurons receive impulses and carry them from the sense organs to the spinal cord or brain. Interneurons connect sensory and motor neurons and interpret the impulse. Motor neurons carry impulses from the brain and spinal cord to muscles or glands.
In what order does a nerve impulse travel?
Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. A synapse is the junction between each axon tip and the next structure.
Do afferent impulses travel the spinal cord en route to the brain?
Afferent neurons enter the spinal cord through the dorsal root, carrying signals from the body to the brain.
How fast does nerve impulse travel?
Nerve impulses are extremely slow compared to the speed of electricity, where the electric field can propagate with a speed on the order of 50–99% of the speed of light; however, it is very fast compared to the speed of blood flow, with some myelinated neurons conducting at speeds up to 120 m/s (432 km/h or 275 mph).
What are the steps of nerve impulse?
The action potential travels rapidly down the neuron’s axon as an electric current and occurs in three stages: Depolarization, Repolarization and Recovery. A nerve impulse is transmitted to another cell at either an electrical or a chemical synapse .
Which has the highest speed of nerve impulse?
Myelinated neurons have a high speed of nerve impulse as compared to non-myelinated neurons.
What is the difference between afferent and efferent pathways?
Afferent neurons carry signals to the brain and spinal cord as sensory data. This neuron’s response is to send an impulse through the central nervous system. Efferent neurons are motor nerves. These are motor neurons carrying neural impulses away from the central nervous system and toward muscles to cause movement.
Where are the neural pathways located in the spinal cord?
The gracilis and cuneate fasciculi, also known as the dorsal columns, are two ascending pathways located side-by-side in the dorsal funiculus of the spinal cord. They carry fine and discriminative touch as well as proprioceptive sensations.
Where are first order neurons located in the spinal cord?
First-order neurons are afferent in nature. The sensory input from the receptors is sent through the peripheral nerve to the spinal/dorsal root ganglion. The body of the first-order neuron, within the ganglia, projects its axons to the posterior gray horn of the spinal cord.
Where does the lateral spinothalamic tract travel in the spinal cord?
The lateral spinothalamic tract travels in the lateral funiculus of the spinal cord and carries the sensations of pain and temperature.
What are the ascending and descending tracts of the spinal cord?
The spinal cord consists of ascending and descending tracts. The ascending ones are sensory pathways that travel through the white matter of the spinal cord, carrying somatosensory information up to the brain.