Nerves

a sense organ

sacrum...Now if you're looking for the sacral region of the spinal cord it originates from upper portions on lumbar vertebrae and extends via cauda equina to exit as it did emryologically

This can be caused by the fact that a surgeon just cut through muscles, ligaments, tendons etc. in your back to get to whatever he/she was specifically repairing. Also, after surgery you are often bed-ridden for a while, and inactivity is a major cause of back pain. Give your back time to heal, try to get active again (based on your doctors recommendations) and if the pain never seems to go away then go back to your doctor/surgeon for further advice.

It is important to study the nervous system in psychology because certain behaviors and mental conditions stem from a known characteristic in the nervous system. Some people suffering from disorders such as Alzheimer's have related neural characteristics.

controls muscles
Relay messages from the Brain in the CNS down through the Spinal Cord and into the PNS, from there the motor neuron synapses on muscle fibers. i.e. knee jerk reflex & the neuromuscular junction.

It's a 'bridge' where the neurotransmitters jump from one neuron to the other. It is called synapse.

This is a simple notion that I have about this subject. For a complete review involving this part of the brain and how it works see the link to "Neuron" below.

Yes, it will help!!

Surgical debridement (also known as sharp debridement) uses a scalpel, scissors, or other instrument to cut dead tissue from a wound. It is the quickest and most efficient method of debridement.

A neuron is called a inter-neuron because that specific neuron takes impulse from one neuron to a next neuron. For example your sensory neuron sends a impulse that you had felt a hot object. It goes through the spine to a inter-neuron to a motor neuron (this processes is called a reflex). Then the motor neuron tells your muscles in your hand to move

synapse

The resting membrane potential is the difference between the inside of the cell relative to the outside. The outside is always taken as 0mv. The resting membrane potential is negative because there is a higher concentration of potassium ions outside the cell (because the membrane is more permeable to potassium ions) than inside. Since potassium ions are positively charged this leads to a negative value.

An electrical charge is spread through your body... The brain sends an electrical current to the point of the nerve to tell the body of the event...

axon

Hair follicle receptors

Motor neurons have the capacity to regenerate as long as the Schwann cells remain intact

Depends on what kind of nerve damage and how severe is it

If it is partial motor nerve then you feel

weakness

Total loss of motor nerve then you cant move that muscle and it will have no muscle tone

if it is sensory nerve then you will have altered sensations

total loss of sensory nerve then you wont feel a thing ...

Nerves can be and are transplanted. There was just a mother who gave two nerves to her son so that he could have sensations in his hands after an accident. It is a relatively new field, but such transplants happen.

These are also called multipolar neurons and they allow for the integration of a great deal of information from other neurons.

The axon is the elongated fiber that extends from the cell body to the terminal endings and transmits the neural signal. The larger the axon, the faster it transmits information. Some axons are covered with a fatty substance called myelin that acts as an insulator. These myelinated axons transmit information much faster than other neurons.

"http://wiki.answers.com/Q/How_many_spinal_disks_are_there_in_human_body

Neurons communicate with each other by sending electrical signals across a synapse. In a three neuron loop the series of events that happen in synaptic transmission are as follows:

• Neuron 1 sends an electrical signal (action potential) down its axon towards the synapse.
• The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 1 into the synaptic cleft.
• The neurotransmitters bind to the receptors of Neuron 2.
• This binding triggers a new action potential in Neuron 2 which travels down its axon.
• The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 2 into the synaptic cleft.
• The neurotransmitters bind to the receptors of Neuron 3.
• This binding triggers a new action potential in Neuron 3 which travels down its axon.
• The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 3 into the synaptic cleft.
• The neurotransmitters bind to the receptors of Neuron 1 closing the loop.

This series of events is repeated continuously allowing for the communication between neurons in a three neuron loop.

Absolute refractory period (time which local area of the membrane

has surpassed the threshold potential and will not respond to any stimulus).

The brain and spinal cord; the cerebro-spinal axis; myelencephalon.

Everyone is aware that caffeine is useful for overcoming tiredness, but not many people understand how. Caffeine actually affects different tissues in different ways; the most stimulating effect actually occurs in the brain. Normally when you start to get sleepy, adenosine molecules bind to receptor proteins stimulating drowsiness. Because caffeine is similar in structure to the adenosine molecules, it binds to the receptors instead, blocking the site from the adenosine. Caffeine also stimulates epinephrine in the heart and liver cells, increasing heart rate and stimulating glycogen conversion to glucose.