What are the functions of the motor nerves?
The engine has nerves with signals from the brain and spinal cord to the muscles and glands throughout the body. They activate voluntary muscles, muscles that are controlled by conscious effort. They are also responsible for reflective events. When motor nerves work abnormally, the results can be considered cramps or as a deterioration of muscle ability. They are different from the sensory nerves that give the brain information from other parts of the body about things about touch, temperature and pain. They are also different from cranial nerves that can be either sensory, motor or both. The motor nerves pair with sensory nerves in the spine to form 31 pairs of mixed nerves.
The brain and spinal cord are known together as a central nervous system (CNS). The motor nerves come from the brain and set off on the two -piece way down the spine. The upper neurons are called the first order neurons, which means they are contained in CNS.
Signals from the first order neurons exceed the gap called synapse to achieve lower motor neurons, neuroThe second order, which extends from the brain stems to the body muscles. Motor neurons end up in short dendrites and transmit their news with a long axon. It has a repeated effect on sensory nerves that have short axons and receive their news from long dendrites.
Motor nerves can respond to inputs from sensory nerves without entering from the brain. The spinal column allows motor nerves to move muscles in response to sensory messages. These automatic reactions are called reflexes and do not require brain input. Reflective actions allow the body to respond quickly to dangerous situations. For example, they cause the muscles to withdraw from the heat source in front of the brain had time to process pain.
damaged motor nerves can often be detected when they cause muscle atrophy or produce twinkling movements. Neurologists often observe how the patient walks to get traces of the functioning of his nervous system. Moto functionRic nerve can be monitored by recording the potential of the electromyograph of the muscles they control. Amyotrophic lateral sclerosis, also known as Lou Gehrig's disease, is a degenerative state of motor nerves. The lesions for the upper motor neurons are responsible for brain palsy.