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spinal cord is a continuation of the brain stem. It is long, cylindrical, and passes through a tunnel in the vertebrae called the vertebral canal. The spinal cord has many spinal segments, which are spinal cord regions from which pairs (one...
spinal cord has many spinal segments, which are spinal cord regions from which pairs (one per segment) of spinal nerves arise. Like the cerebrum and cerebellum, the spinal cord has gray and white matter, although here the white matter is on...
myelin , which is produced by the same Schwann cell. Such fibres are called myelin. Other fibres have the sheath of myelin and deep grooves remain within Schwann cell.Schwann cells originate from the neural crest and accompanying axons duri...
- must interact favorably with the environment so that they can survive and reproduce. They must be aware of their surroundings so they can react to circumstances to better their chances for survival. Awareness has been set at a very high ...
depression have overwhelming feelings of sadness, hopelessness, and helplessness. Suicide is a danger if you are depressed.” Depressive disorders are the most common form of mental disorders both in the community and in health care settings...
electromagnetism. In 1831, Michael Faraday starts to experiment with electromagnetic induction. By 1833, Duchenne de Boulogne had begun experiments involving the simulation of muscles with surface electrodes. This was followed in 1853 by He...
act most strongly on mood are psycho-stimulants and opiates. Psycho-stimulants, such as their name suggests increase alertness and decrease fatigue and sleep; this is the case of amphetamines and cocaine. By contrast, opiates such as morph...