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Nervous System KT

QuestionAnswer
nervous system a complex, highly organized system that coordinates all the activities of the body. This system enables the body to respond and adopt to changes that occur both inside and outside of the body
neuron the basic structural unit of the nervous system. Its consisted of a cell body containing a nucleus, nerve fiber, which carries impulses away from the body cell
axon a single nerve fiber, which contains impluses away from the body cell.
myelin sheath the lipid fat that covers on axon
neotransmitters special chemicals, located at the end of each axon, allow the nerve impulses to pass from one neuron to another
nerve a combination of many nerve fibers located outside the brain and spinal cord
afferent sensory, nerves carry messages from the brain and spinal cord
efferent or motor, nerves carry from the brain and spinal cord to the muscle and glands
Associative nerve a nerve that carries both sensory and motor messages
central nervous system consists of the brain and spinal cord
PNS consists of the nervous and has two divisions which are the somatic nerve system and the automatic nervous system
somatic nerve system carries messages between the CNS and the body
automatic nervous system contain the sympathetic and parasympathetic nervous system, which work together to control involuntary body functions
brain a mass of nerve tissue well protected by membranes and the cranium or skull
cerebrum the largest and highest section of the brain the outer part of the cerebrum organized folds called convolutions and separated into lobes. Responsible for memory,thought,judgement,voluntary movement and the five senses
Cerebellum the section below the cerebrum, its responsible for the muscle coordination, balance, posture and muscle tone
Diencephalon the section located between the cerebrum and midbrain contains the structures: the thalamus and hypothalamus
thalamus acts as reply center and directs sensory impluses to the cerebrum. it allows the body to recognize pain and temperature
hypothalamus regulates and controls the automatic nervous system, temperature, appetite, water balance, and blood vessels. and also involved with in anger, fear, pleasure, pain, and affection
midbrain the section located below the cerebrum at the top of the of the brain stem, it's responsible for conducting impulses between brain parts and for certain eyes and audiotory reflexes
Pons the section located below the mid brain and in the brain stem. It is responsible for conducting messages to other parts of the brain, for certain reflexes actions including chewing, tasting, and saliva productions, and assisting with respiratory
medulla oblanagata the lowest part of the brain stem. It is responsible for regulating heartbeat, respiration, swalloing, coughing, and blood pressure
spinal cord continues down forward the medulla oblangata and ends at the first and second lumbar vertebrae. It is surrounded and protected by the vertebrae. It's responsible for many reflex actions and for carry messages up to the brain and motor messages.
meninges three membranes that cover and protect the brain and spinal cord
dura mater the thick tough outer layer
arachnoid membrane the middle layer is delicate and weblike
pia meter closely attached to the brain and spinal cord and contains blood vessels that nourish the nerve tissue
ventricles hollow spaces that connect with each other and with the space, under the arachnoid membrane
cerebraspinal fluid the ventricles are filled with this fluid
choraid plexuses special structures that are produced in the ventricles of the brain
arachoid villi special structures that carry cerebrasspinal fluid come through the bloodstream. After circulatory, it is absorb into the the blood vessels of the dura mater and returned to the bloodstream through those structures
Created by: Sergiosaurs
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