What is central nervous system?
Central nervous system of human consists of the brain and spinal cord that are both protected in the three ways
The first ways is the
Cranium
Cranium is a part of skull that protect the brain and the neural arches. The brain and spinal cord are also protected by triple layers of the meninges. The cerebrospinal fluid similar in the concentration to the blood plasma bathes the neurons of the brain and spinal cord and it cushions against the bumps and jolts. Both brain and the spinal cord are hollow in its inner sphere. The spinal cord has central canal and brain has many cavities filled by C S F that are also between the meninges.
Peripheral nervous systems
Peripheral nervous system comprises of the sensory neurons and the motor neurons that can form ganglia and the nerves. Ganglia are the concentrations of the cell bodies of neurons. The nerves are the bundles of the axons or dendrites, bounded by connective tissues.
Nervous disorders in humans bodies
Following are more common diseases of nervous systems in human bodies.
Alzheimer s disease
Alzheimer s disease was early described by the Alois Alzheimer in 1907. It is mentioned by the decline in the brain function.
Symptoms
Its symptoms are similar to those disorders which results dementia. There is a genetic pre disposition to the disease in some people so it tends to run in next families. There is also evidence that high levels of aluminium can contribute to the one set of this disorders. There is also decline in brain function with age limit.
Parkinson s disorder
Parkinson s disorder is a nervous disorder, characterized by the involuntary tremors, diminished motor power and rigidity. The mental faculties are not affected. The disease is believed to be caused by cell death in brain area that develops dopamine. One set of disease is usually in 50 s and 60 s. The disorder is slowly progressive the patient can live for many years. The disorder can result by head trauma.
Effective drugs are available such as L-dopa. A naturally occurring protein called glial cell line derived neurotrophic factor has been shown to boost uptake of dopamine when delivered to lab rats and monkeys. G D NF may be used in near future for humans in the treatment of this disease.
Epilepsy
Epilepsy is one of the convulsive disease of nerves which are mentioned by abrupt transient signs of the motor sensory psychic or also autonomic nature, frequently associated with alters in the consciousness. These alters are belied to be secondary to sudden transient alterations in brain functions associated with excessive rapid electric discharges in the gray matter.
Age limits
The one set of the epilepsy is commonly before the age of 30 years old. Later age one set suggests organic disorders. In some patients, emotional disturbances play a important trigger role. Anticonvulsant drugs are being used for this purposes. Alcohol aggravates epilepsy, so persons suffering from epilepsy should avoid from drinking of alcohol.
