patient information handouts peripheral nerves peripheral nerve conditions what are peripheral nerves? viagra 100 alkohol Anatomy the human nervous system consists of four parts: the brain, spinal cord, autonomic nervous system, and peripheral nerves. Peripheral nerves are cord-like structures containing bundles of nerve fibers that carry information from regions of the body to the spinal cord (and vice versa). viagra 20 mg street value Constructed in a fashion similar to telephone cables, peripheral nerves have a tough outer layer of connective tissue that surrounds discrete groups of miniscule fibers, called "axons," each originating from its own nerve cell. Peripheral nerve function the primary function of a peripheral nerve is to transmit signals from the spinal cord to the rest of the body, or to transmit sensory information from the rest of the body to the spinal cord. For example, to flex a muscle, the brain sends a signal to the spinal cord that is received by a motor neuron in the spinal cord. buy cheap viagra This neuron sends the signal down an axon, which may be up to 3 feet long. buy generic viagra This axon terminates in a muscle, where the impulse to flex is received. viagra dosage 40mg Once the muscle receives this signal, it flexes. natural viagra reviews The whole process requires only a fraction of a second to occur. Some nerves in the body, such as the sciatic nerve, are quite large and can be over 1 cm in diameter. get real viagra uk Other peripheral nerves are so small that they cannot be readily seen without magnification. Overview of peripheral nerve entrapments peripheral nerve entrapment occurs when a nerve suffers from chronic compression along its normal anatomical course. online viagra Nerves normally are found within smooth channels or hollow spaces between bones, muscles, or ligaments. These spaces can become narrowed due to a variety of causes. online viagra pills For example, ligamentous scarring from trauma, bony enlargement due to arthritis, or muscle enlargement from overuse can all narrow the space available for nerves, compressing them. When nerves are compressed, their blood supply is reduced, a condition called ischemia. To illustrate, sometimes a person will fall asleep on their arm, impairing the circulation to the extremity. When the blood supply drops, the nerves stop working properly. When the person wakes up, the arm may feel "asleep. " there may be "pins-and-needles" sensations, or even weaknes. buy viagra canada