The disease is thought to be caused by cell death in a brain area that produces dopamine. It is a nervous disorder, specified by involuntary tremors, reduced motor power, and rigidity. contraction of the pupil, promotes digestion of food, slows down heartbeat.įollowing are a few of the common disorders of the nervous system in humans: It promotes all the internal actions which are associated with the relaxed state i.e. Most ganglion fibers of the sympathetic system develop from the middle portion of the spine and almost end in ganglia that lie near the spinal cord. The autonomic system is further divided into 2 parts: Sympathetic Nervous System This system enables these functions to occur without requiring to purposely to consider them occurring. Simply put, it is the autonomic system that manages elements of the body that are generally not under voluntary control.

The autonomic system is the part of the peripheral nervous system that’s responsible for controlling involuntary body functions, such as blood circulation, heartbeat, digestion, and breathing. It is these sensory neurons that enable us to take in sensory information and send it to the brain and spine. Sensory neurons: Also called afferent neurons, sensory neurons carry information from the nerves to the central nervous system. These motor neurons permit us to take physical action in response to stimuli in the environment. Motor neurons: Also called efferent nerve cells, motor neurons carry information from the brain and spine to muscle fibers throughout the body.

Somatic nervous system consists of