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A & P Nervous System

Peripheral Somatosensory senses associated with skin, muscles and joints
Special senses taste, smell, vision, hearing and balance
Motor Information flows away from CNS, toward muscles and glands. Also called Efferent or descending pathway
Interneurons neurons that are only found within the CNS. Where information is passed from one part of the brain to another
PNS Neuroglia Cells that protect and support nerve cells.
Myelin Sheath Inner portion of neurolemmocyte. Insulates the axon
Nuclei Clusters of somas in the CNS
Soma nerve cell body
Dendrites Short, numerous projections from the soma. Recievers of incoming chemical signals, convert them to electrical signals
Epyndymal Cells Found around ventricles in brain. Produce cerebral spinal fluid
Oligodendrocytes Wrap around axons in the CNS
Microglia White blood cell that has left the blood stream and patrols the CNS for bacteria or viruses
Astrocytes Prevent waste from getting in bloodstream. Cover blood vessels, form a blood brain barrier
Satellite Cells located around the nerve cell body. Nourish the nerve cell
Neurofibril Nodes Gaps between neurolemmocytes where axon is exposed
Neurilemma thick, outer part of neuroglia. Where cytoplasm and organelles are.
Neurolemmocytes Wrap around Axons and protect them
Ganglia Clusters of somas in the PNS
Axon Hillock where an axon meets a soma
Nerve impulses Electrical signals
Collaterals where an axon branches
Axon Terminals numerous short branches at the end of an axon
Nerves Bundles of axons all wrapped up and traveling together
Epineurium Connective tissue that wraps around an entire nerve
Perineurium surrounds small bundles of axons within a nerve
Fasicles bundles of axons
Endoneurium connective tissue that surrounds each individual axon
Synaptic Terminal enlargements at the end of each axon terminal
Vesicles hollow sacs that contain chemicals
Neurotransmitters chemicals that fill each vesicle, used for communication from one nerve cell to another
Synapse Gap or space where a nerve cell communicates with its target
Targets of nerve cells Dendrites, muscles, and glands
Serotonin Sleep, mood and hunger neurotransmitter
Dopamine Euphoria neurotransmitter
Norepinephrine Neurotransmitter that increases heart rate and level of alertness
Acetycholine Neurotransmitter that controls skeletal muscle cells in PNS
Somatic Voluntary nerves
Autonomic Involuntary nerves we don't consciously control
Sympathetic Nervous System dominant or active in an emergency. Controls fight or flight response
Parasympathetic Nervous System dominant when at rest or calm
PNS Sensory Afferent or Ascending Pathway. Relays information to CNS
Somatosensory All senses outside of the head
Visceral Somatosensory Relays information from organs
Peripheral Nervous System All nerves in the body besides brain and spinal cord
Created by: willowguns
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