FUNCTIONS The nervous system is responsible for coordinating and controlling body function and activity. It receives information from both internal and external sensory receptors and adjusts the activity of muscles and glands accordingly to match the body’s needs. The nervous system consists of the central ner vous system (CNS) and the peripheral ner vous system (PNS).
CENTRAL NERVOUS SYSTEM The central nervous system consists of the brain and spinal cord. Sensory information comes into the central nervous system to be processed and motor messages exit carrying commands for the glands and muscles.
PERIPHERAL NERVOUS SYSTEM The peripheral nervous system consists of cranial and spinal ner ves. These sensory nerves carry information to the central nervous system while motor nerves carry the commands to the muscles and glands.
SUFFIXES I will be presenting two suf fixes and use them to provide an example of their use in the nervous system. The suf fixes I will be reporting on are : -plegia -taxiaThe suf fix –plegia means “paralysis”The suf fix –taxia means “internal ordering or arrangement”
PARAPLEGIA Paraplegia is a type of paralysis that af fects all or part of the trunk, legs and pelvic organs and is characterized by loss or impairment of motor or sensory functions. It is the result of a lower spinal cord injury, usually from motor vehicle injuries, sports accidents or falls. When the spinal cord (CNS) is damaged, impulses will no longer travel to and from the brain correctly and muscles and glands will not receive proper commands.
THE SYMPTOMS Symptoms include: -loss of sensation, motion and reflexes -loss of bladder and bowel control -sexual dysfunctions -pain caused by damage to spinal nerves Dif ficulty breathing and coughing
ATAXIA Ataxia is characterized by a lack of muscle coordination during voluntary movements such as walking or picking up objects. It is the result of damage to a certain section of the brain : the cerebellum. The cerebellum, second largest portion of the brain, aids in coordinating voluntary body movements.
THE SYMPTOMS Ataxia’s symptoms include : Poor coordination Unsteady walk and a tendency to stumble Change in speech Dif ficulty swallowing Dif ficulty with fine -motor tasks such as eating and writing Involuntary back and forth eye movements