Nervous System

Compression of the median nerve causes tingling and numbness in the thumb, forefinger, middle finger and on the thumb-side of the fourth finger. It may also cause pain in the forearm and occasionally into the shoulder.

The vagus nerve arises as a group of rootlets on the anterolateral surface of the medulla oblongata.

The nerves innervate the quadriceps. The afferent nerves are the muscle spindles and the efferent are the motor neurons.

There are different types of nerves in the human body namely: the cranial nerves, the spinal nerves, the sympathetic nerves, and the encephalon nerves just but to mention a few. Examples of these nerves includes: the optic nerve, the facial nerve, the vagus nerve, the thoracic nerve, and accessory nerve.

Barbiturates. Also, benzodiazepines, when administered in significant dosages.

The nervous system maintains homeostasis by sending signals to the brain and the rest of the body.

The parasympathetic system counteracts the sympathetic system.

It sends messages that control all the systems in the body.

If you don't breathe the nervous system won't work

Vitreous Humor: fluid that fills the large central chamber of the eye. It helps focus light onto the retina.

. Retina: The inner most layer of the eyeball. It contains photoreceptor cells that transmit signals from the optic disc to the optic nerve.

Rods and Cones: Rods are sensitive to light but do not distinguish colors, where as cones are responsible for daytime color vision.

. Optic nerve: Nerve that connects the eye to the brain.

Blind spot: Area of the eye that does not contain any rod or cones. It is here that the eye is attached to the optic nerve.

Fovea: Area of the retina that contains the highest concentration of cones. Does not contain any rods.

Ear: Parts of the ear:

. Pinna: The ear lobe which functions as a sound gatherer.

. Outer ear (canal): A canal that connects the outer ear with the ear drum (tympanic membrane).

Tympanic membrane: A thin piece of tissue that blocks off the outer and middle ear. It transmits sound waves to the three tiny bones of just behind it.

Hammer, anvil, and stirrup( middle ear): The three bones of the middle ear. They vibrate sending the impulses to the oval window of the cochlea.

Semicircular canals ( inner ear): Located in the inner ear and used in the sense of balance. The fluid in the canals move to notify the brain of any problems with the organisms balance.

. Cochlea: A coiled structure located in the middle ear containing tiny hairs that change sound waves into nerve impulses.

Auditory Nerve: Connects the ear with the brain

The system of the body is made of the brain spinal cord and nerves is known as the nervous system. The nervous system controls the body's voluntary and involuntary actions and transmits signals between different parts of its body.

Eye movement is controlled by cranial nerves III, IV, and VI (Oculomotor, Trohlear, and Abducens, respectively). CN III innervates most of the muscles of the eye and is responsible for most eye movements.

By taking illegal drugs this effect our brain, our brain becomes weak and we are not able to control what we are doing. We will loose many blood cells and because of that, our brain is beginning to play mind games with us. You can see when somebody has taken cannabis because they begin to show slow reactions and unexpected giggling. In addition, illegal drugs effect our nervous system this shows off by shaking hands a lot and we are unable to stop it from doing so.

a nerve cell can be metres long so it has more area to Cary the nerve impulse away from the cell body.

There is no such thing. Were something non-contractile, it would cease to be called a muscle. You probably meant "What is a contractile muscle structure?" or something similar. There are many such answered questions on here.

I am familair with this one because my wife experienced this just last year but I don't even know how or why it happened. A nervouse breakdown is caused by an intense, continuous amount of stress an individual undergoes. Whatever type of stress it is, it is triggered to the brain as unsurmountable thereby unable to be handled causing a collapse or 'breakdown' in the nervous sytem of the mind. Individuals who have suffered from nervouse breakdowns sometimes appear to be disabled because they behave like those of whom are mentally impaired.

my husband has t2 intense foci in the subcortical white matter in the frontal and parietal reigon these are compatible with foci of chronic ischaemic change the finding is related to small vessel disease his mood swings are getting worse would this disease be a part of mood swings.

i have had 5 years of nerve damage to my side. constant pain when will it be better ANSWER You should go and get assessed by a doctor or a physiotherapist that will be able to tell you how things are done and how they will get better.

Sensory receptors in the dermis include: free nerve endings, pacinian corpuscles, and hair follicle receptors The mechanoreceptors of the skin are the meissner's corpuscles (which respond to light touch), the pacinian corpuscles (deeper in the dermis and respond to pressure), and the merkel's disks (closely related to the merkel's cells located in the epidermis and respond to light touch). The nociceptors are pain receptors that recognize hot, cold, and pain.

Damage to the nervous system can be very long term. It all depends on where the damage occurs. If at the spinal cord, the muscles may not respond. If in the brain, perhaps sight will be lost. Death can occur if the brain is damaged.

If the human kind was created without a nervous system, we would not feel anything. For example, if I poked you and you didnt have a nervous system, yiu wouldn't feel it. I could slap your back and you wouldn't feel it.

Don't worry I won't slap you.

I don't even know you. lol

Glad I could help :)

The most immediate effect would be an increase in heart rate. In addition, regulation of heart rate, contractile state, and conduction of electrical impulses through the heart would be impaired.

The reason for the observed effects are that the vagus nerve carries important information to the heart from a part of the central nervous system called the parasympathetic nervous system. The parasympathetic nervous system is often considered the "rest and digest" system. It decreases heart rate, decreases how strongly the heart contracts with each beat, and decreases the rate at which electrical impulses are conducted through the heart. This is in contrast to the effects of the sympathetic nervous system on the heart; the sympathetic nervous system raises heart rate, force of contraction, and rate of electrical conduction in the heart.

A normal heart does not require information from the parasympathetic and sympathetic nervous systems in order to beat. The heart has an intrinsic pacemaker that allows it to generate heart beats on its own. The heart's pacemaker generates a pace at a rate of about 100 cycles per second, which means that if the heart was to take matters into its own hands (ie, have no innervation), then it would beat at about 100 beats per minute (bpm).

If that's the case, then why do normal adult hearts beat around 70 beats per minute and not 100?

As was hinted at above, normal hearts are innervated by the parasympathetic and sympathetic nervous systems. And both act on the heart at the same time. While you might think that the systems would cancel each other out, it turns out that the heart receives more sympathetic stimulation than parasympathetic stimulation at rest. The result is that the heart is effectively told to reduce the heart rate from the normal 100 bpm to something closer to 70 bpm.

Thus if you take a normal heart at rest that's innervated by both sympathetic and parasympathetic systems, and then sever the vagus nerve, you lose the parasympathetic input to the heart, while leaving the sympathetic input intact. The result is that the resting heart rate increases, to something closer to 100 bpm. ________________________________________________________________________ Cutting the vagus nerve would increase the heart rate. At REST there is more Parasympathetic input to the heart because it slows the heart rate. However during activity there is more sympathetic imput than parasympathetic imput. If all nerves were cut from the heart it would continue to beat in a Ryhmic way because of the electrical system, as demonstrated in heart transplants.

Depressant Drugs:

Alcohol, Benzodiazepines, Barbiturates and other central nervous system depressant drugs act primarily on a neurotransmitter substance known as GABA (Gamma Aminobutyric Acid). GABA is an inhibitory neurotransmitter that makes other neurons less likely to activate. The depressant drugs are GABA agonists, acting to help GABA reduce neuronal activation more efficiently than it usually would. Alcohol also inhibits (acts as an antagonist against) another excitatory neurotransmitter (Glutamate), making it harder for Glutamate to get the nervous system excited.

Stimulant Drugs

Amphetamines have their primary effects on the neurotransmitter Dopamine. Amphetamines both induce the terminal button of Dopamine-producing neurons to let more Dopamine out than normal, and also keep that Dopamine out in the synapse longer than it normally would be allowed to stay. Amphetamine also acts agonistically on receptors for a different neurotransmitter, Norepinephrine, by competing with Norepinephrine for post-synaptic receptors and turning those post-synaptic receptors on.

Cocaine has its major effect by blocking the re-uptake of the neurotransmitters Dopamine and Serotonin.

Opioid Drugs:

Opioid drugs bind to special endorphin receptors in the brain (the 'mu', 'kappa', 'sigma' 'delta' and 'gamma' receptors) that have to do with pain. When these receptors are occupied and activated, the perception of pain lessens.

Drug treatments for opioid addictions sometimes include the administration of Naltrexone, which is an opioid antagonist. Naltrexone competes with the opioids for their receptor sites, but is not itself capable of activating those receptor sites. An opioid addict on Naltrexone is thus rendered more or less incapable of getting high from their opioid drug of choice; they may take an opioid, but it will be blocked from the opioid receptors by the Naltrexone, and will not have its effect.

Cannabinoids:

Marijuana has a complex set of effects. It acts on the neurotransmitters Serotonin, Dopamine and Acetylcholine. It also binds to a receptor for a recently discovered neurotransmitter known as Anadamide.

Hallucinogens:

LSD is known to antagonize Serotonin by blocking its release.

There are several things to do that might help:

* Frequent bathing * Frequent changes of clothing * Avoid foods that cause body odors * Use deodorant, but to prevent sweating use the kind that says, Antiperspirant. * Keep your clothes loose fitted around the armpit as circulation of air keeps the armpit from having an odor * Dress in natural fibers

If the problem is really bad, a doctor may be of some assistance. There are products made specifically for this problem, some of which can be found in many drug, discount and health food stores. One, in particular, is a salt/mineral salt product. Salt has some natural anti-bacterial properties, so this may help eliminate the problem, since quite often, it is bacteria that causes the odor. This can also help with sweaty and/or smelly feet.

resting and digesting