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Nervous Name: Priscila Llamas …
Nervous Name: Priscila Llamas Period:5
Major functions of the nervous system
movement
internal process of physiology
thinking
Major parts and functions of the brain
Cranial nerves
Spinal nerves
Compare and contrast the autonomic nervous system
Neurotransmitters
Chemical messengers in synapse that convey electrical impulses from neuron to another cell
Dopamine
PNS
CNS
sense of feeling good
Histamine
Norepinephrine
CNS
sense of feeling good
PNS
excite or inhibit autonomic nervous system actions
Serotonin
Acetylcholine
CNS
Controls skeletal muscle actions
PNS
Stimulates skeletal muscle contraction at neuromuscular junction
Major division and subdivisions of the nervous
system
Peripheral nervous system (PNS)
Made of cranial and spinal nerves that connect the CNS to the rest of the body and have sensory and motor division.
Central nervous system (CNS)
Made of the brain and spinal cord, responsible for the integration of info and decision making.
Tissues
Perineurium
covering around fascicles (bundles) of nerve fibers.
Endoneurium
covering around individual nerve fibers
Epineurium
outer covering of a nerve.
Connective Tissue Coverings
Action potential and the nerve impulse
Action potential
Action potential either occurs or not, it occurs when the charge reaches -55mv. Action potentials are the same strength and when the potential is reached it returns to resting -70mv by re-polarization. At the end of re-polarization, it goes to polarization, and the potassium ions flow.
Impulse
The neuron maintains restoring potential, threshold stimulus is received snd sodium channels in the trigger zone of axon open, ion diffuse inward, the axon membrane, potassium channels open.
Major parts and functions of the spinal cord
n
Reflex arc
Classification of neurons
Functional
Internueron
multi-polar neurons lying within the CNS form links between other neurons, cell bodies of some interneurons aggregate in nuclei
Motor neurons
muli-polar neurons that conduct impulses from CNS to peripheral effectors
Sensory neurons
conduct impulses from peripheral receptors to the CNS, usually uni-polar, some are bipolar
Structural
Bipolar
2 processes extending from cell body, a dendrite and an axon found in some senses, eyes, nose and ears
Uni-polar neurons
1 process extending from cell body, splits into 2 that function as 1 axon
Multi-Polar
have many dendrites and 1 axon higher from cells