Results for: Nerve

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In Nerves

What is a nerve?

The Peripheral Nervous system (PNS) includes all the neural tissue outside the Central Nervous system (CNS). The PNS delivers sensory information to the CNS and carries motor … ( Full Answer )

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In Human Anatomy and Physiology

What do nerves do?

One kind specializes in bringing information into the brain fromthe senses. These are called afferent/sensory nerves. They helpbring information into the five special senses; … ( Full Answer )

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In Biology

Why do you have nerves?

You have nerves so that you are able to move. If you didn't have any nerves you would be a very still person.

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In Definitions

What is nerve?

Nerve means a person's mental state - the extent to which they areanxious or worried; it can mean to brace yourself to meet ademanding situation as well.

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In Biology

What if your on my nerves?

You mean "you're" (= "you are"), not "your", which is "your" as in "your book." And we don't usually say, "You're on my nerves." We say, "You're getting on my nerves." So yo… ( Full Answer )

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In Human Anatomy and Physiology

What does a nerve do?

A nerve sends messages to your brain that you are feeling something. For example, if you fall over and scratch your arm, your nerve will send a message to your brain to feel t… ( Full Answer )

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In Human Anatomy and Physiology

How do nerve signals travel from nerve to nerve?

This is a very long and hard 1-2 weeks of worth of work and studying to understand but ill try my best. A neuron consists of the following structures in the following order… ( Full Answer )

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In Human Anatomy and Physiology

How is an impulse transmitted from nerve to nerve?

A neural impulse is transmitted via neurotransmitters , which are chemicals which move from the end of one neuron to the beginning of the next one. This happens as fol…lows: there is a gap between neurons called a SYNAPSE (a very small space between the end of one neuron and the beginning of another). An impulse traveling within the first (initiating) neuron (along its axon ) which has reached that presynaptic neuron's axon terminal causes voltage-gated Calcium ion pores to open in that axon terminal, allowing Calcium ions into that axon terminal, which causes small bags ( vesicles ) of chemicals ( neurotransmitters ) to move to and merge with the cell membrane at the end of that axon terminal (which is the beginning of the synapse), releasing the neurotransmitters into the space between two neurons (the synaptic cleft ), where they DIFFUSE quickly over to the SECOND neuron, (usually at a dendrite or dendritic spine), where the neurotransmitters bounce around in or slide into or otherwise fit into the RECEPTOR sites of ligand-gated Sodium ion PORES on the SECOND or receiving neuron (ligand-gated simply means chemically activated), causing those pores to open , allowing Sodium ions to enter the dendrites of the receiving neuron, which causes the beginning of the neural impulse as they bump into or electrostatically push sodium ions already within the neuron (which is a graded response , which means it gets smaller and smaller in strength as it travels further and further along the dendrite, and is known as electrotonic conduction ). This impulse travels down the dendrite, across the soma (body of the neuron), to the axon hillock (where the axon or output of the neuron begins), where any and all such multiple inputs are summed up , and, if they yield a sufficiently high enough voltage potential in summation, trigger an action potential (the neural impulse within & along the axon) in the initial segment of the axon, which then propagates along the axon by successive openings of voltage-gated sodium ion pores which let in more sodium ions, which opens more pores, etc., in a chain reaction. If the axon happens to be myelinated , from a succession of glial cells wrapped along it as insulation, then electrotonic conduction (which is fast , but degrades in strength over longer distances), will occur in the axon under those glial cells, which activates an action potential in the gaps between the glial cells, (known as the nodes of Ranvier ), which re-strengthens the impulse, resulting in an impulse which can travel longer distances faster than it would in an un-myelinated axon purely by the action potential; such impulse conduction in a myelinated axon is called saltatory-conduction . Un-myelinated neurons in the cortex of the brain ( grey matter ) are tightly packed and their axons run much smaller distances from one to another than the white matter myelinated axons which connect to more distant parts of the brain, so the neurons in the cortex don't need the 'speed improvement' provided by myelination. Read more: http://wiki.answers.com/Q/How is nerve impulse transmitted#ixzz1Hmd2WU5s . ( Full Answer )

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In Nerve Pain

What nerves do the sciatic nerve combine?

The sciatic nerve is a combination of the common fibular (peroneal) nerve and the tibial nerve.

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In Human Anatomy and Physiology

What type of nerve is the auditory nerve?

The auditory nerve (8th cranial nerve) picks up signals originatingin the environment and takes them to the brain for interpretation.That makes the auditory/acoustic/vestibulo… ( Full Answer )