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Nerves
Nerves are thread-like structures that form a network of pathways that transmit information from the brain to the body and the body to the brain, in the form of electrical impulses.
1,605 Questions
Where do auditory nerve signals originate?
The auditory nerve, which is part of cranial nerve VIII or the vestibulocochlear nerve, connects the hair cells of the cochlea in the inner ear with the cochlear nucleus, located in the brainstem at the junction of the pons and medulla.
What part of the nervous system perceives cutaneous sensations such as warmth?
The part of the nervous system that enables us to experience the sensation of hot or cold, pain or pressure is the hypothalamus, located in the brain. The hypothalamus sends messages to the rest of the body. As an example, when you begin to shiver from cold, the hypothalamus sends a message to muscles to begin to work quicker, generating heat.
What is treatment for pinched nerve in thumb?
Pinched nerves can be treated several ways; the most common treatment is a chiropractic adjustment. Muscle relaxers and anti-inflammatory medications can be prescribed for the pain and discomfort of a pinched nerve.
Can a neuron have multiple axons?
No, each neuron has only one axon, but has multiple dendrites so it can receive information from multiple axons from other multiple neurons.
Where are nodes of ranvier found?
In the fatty myelin sheath there are gaps between the axons. The myelin sheath gaps are referred to as the nodes of Ranvier.
What muscle is innervated by the femoral nerve?
- The branch to the Rectus femoris enters the upper part of the deep surface of the muscle, and supplies a filament to the hip-joint.
- The branch to the Vastus lateralis, of large size, accompanies the descending branch of the lateral femoral circumflex artery to the lower part of the muscle. It gives off an articular filament to the knee-joint.
- The branch to the Vastus medialis descends lateral to the femoral vessels in company with the saphenous nerve. It enters the muscle about its middle, and gives off a filament, which can usually be traced downward, on the surface of the muscle, to the knee-joint.
- The branches to the Vastus intermedius, two or three in number, enter the anterior surface of the muscle about the middle of the thigh; a filament from one of these descends through the muscle to the Articularis genu and the knee-joint. The articular branch to the hip-joint is derived from the nerve to the Rectus femoris.
- The articular branches to the knee-joint are three in number.
- One, a long slender filament, is derived from the nerve to the Vastus lateralis; it penetrates the capsule of the joint on its anterior aspect.
- Another, derived from the nerve to the Vastus medialis, can usually be traced downward on the surface of this muscle to near the joint; it then penetrates the muscular fibers, and accompanies the articular branch of the highest genicular artery, pierces the medial side of the articular capsule, and supplies the synovial membrane.
- The third branch is derived from the nerve to the Vastus intermedius.
Yes, it does.
In contrast, the sympathetic nerves release adrenaline
A neuron that is polarized is also at rest potential. At this stage it is not conducting an impulse and has sodium ions on the outside and potassium ions on the inside.
When you stub your toes the information is sent to the brain using what?
The pain goes through dendrites and nerves in your feet, legs, and back (through the spinal cord) until it reaches the brain. Rubbing a recently-stubbed toe usually makes it feel better for most people.
AND -neurons
State why there is a brief delay in the transmission of an impulse across the synapse?
The impulse must go from one neuron to the next. To do this, it must change from an electrical to a chemical signal, and back to an electrical signal when it reaches the next neuron. Electrical signals are impossibly fast, but neurotransmitters cannot cross a synapse that fast. So, the impulse is at its slowest point when it crosses the synapse.
Can neurotransmitters cross the synaptic cleft?
Yes, neurotransmitters diffuse across the synaptic cleft to transmit a neural signal; the actual neural impulse(spike) occurs when the neuron fires in response to a sufficiency of signals received.
How do the three types of neurons work together to produce a response to an environmental stimulus?
They are sensory input, integration, and motor output. It sends signals to the brain.
What is the direction of impulse in a neuron?
A nerve impulse travels toward the actual nucleus itself to pass information.
What is an example of sensory neurons?
An example of afferent neuron would be using a sense. In this case we will choose touch or feel. EX: Your Hammering the door and suddenly u smash a finger. First it started with a smash then that feeling passes through your sensory nerves which pass through your whole body ending at the brain which makes u feel pain. That is an afferent neuron experience.
How the neuron allow impulse transmission?
A neuron is able to conduct electrical signals and/or neural impulses by means of the movement of electrically charged ions along and into and out of sections of the neuron.
A neural signal is initiated in a neuron as neurotransmitter chemicals are released by another neuron into a small space near the neuron. As the neurotransmitters diffuse across the gap (called a synapse), they move into receptor sites on the post-synaptic neuron. The receptors are cave-like hollows or pits which are part of ligand-gated sodium ion pores, which also have a tunnel part which can be opened or closed. The tunnel part, the pore, is normally closed, but when the neurotransmitter fits into the receptor site, its presence causes the tunnel ( the pore) to open, and allow sodium ions into the post-synaptic neuron.
As the electrically charged ions enter the neuron, they repel one another away from the entry point, in a process called electrotonic conduction, moving down the dendrite and along the surface of the soma (body of the neuron), until they pile up at the beginning of the axon, at the axon hillock. This movement of ions amount to an electrical current.
At the axon hillock, if the voltage manifested by the piled up ions is high enough, it will cause voltage-gated sodium ion pores to open in the initial segment of the axon, allowing more electrically charged sodium ions in, which opens more nearby v-gated Na ion pores, which lets more sodium ions in, and this process continues down the axon in a process called an action potential, which simply means a 'moving' or 'active' voltage (potential), which constitutes an electrical signal, specifically an impulse (because at any point along the axon the membrane voltage rises suddenly to a peak value, and then falls back to the resting membrane voltage).
The result of all of this is that a voltage has moved along the neuron, as an electric signal.
Where in the eye is the optic nerve located?
its in the optic chiasm which leads to the back of the eye
the membrane potential became less negative because less potassium ions went out of the cell (since the extra cellular space has higher concentration of potassium, and potassium goes down its concentration gradient, from high concentration to low concentration). since less potassium (K+)which is positive, left the cell more it became more positive (less negative)
What happens to the dermis when you touch something hot?
- What will happen is that when you touch the hot object the nervous system will send a signal to the brain which will make you react to the hot object and that is what happen when you touch the hot object . Example : a hot stove , a hot light bud, the seat in the summer which is like burning your bum ,and that are some example for hot object...or it will hurt alot
Why do your hands fall sleep when you sleep?
my hands fall asleep at night if i have them positioned above my head
AnswerThe most common thing that can cause your hands to fall asleep at night is probably just sleeping on them wrong (ie.. wrist is bent in awkward position while you sleep)If it keeps occurring though,especially with morning symptoms of numbness and tingling,and you have risk factors of repetitive hand use,diabetes,obesity,arthritis etc... you may have carpal tunnel syndrome(CTS).A condition caused from pressure or damage to the median nerve that runs through your wrist joint.
Existing CTS can be aggravated by sleeping with wrists in a bent position,then when you wake up,you shake them to "get them awake."
Most people assume (incorrectly) they have a blood circulation problem,when in fact it's a crimped nerve problem.Sleeping in night or nocturnal braces often help.
Learn more at carpal-tunnel-symptoms.com
As strange as it might seem try stopping drinking coffee or tea and its not the Caffine so I include DeCaffinated as well. Once I stopped so did the problem.
There are three types of neurons.
1.Sensory neurons: which carry impulses from the sense organs to the brain and spinal cord.
2.Motor neurons : which perform an opposite function to that of sensory neurons by carrying impulses from the brain and spinal cord to muscles and glands.
3. Inter neurons : which connect sensory and motor neurons and carry impulses between them.
