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The spinal cord and brain is part of the
central nervous system
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impulses cross a synase with the help of
chemicals, like actylcholine
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the parasympathatic division controls
most normal day involuntary activities of our body
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the iris of our eyes contain
smooth involuntary muscle
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The inner area of the ear includes the
cochlea, vestibule, semicircular canals
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the specialized endings (beginnings) of sensory neurons are called
cutaneous receptors, hearing receptors, and visual receptors
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the level of stimulation that must be reached before a neuron will "fire up" is called the
threshold
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the ortion of the neuron carrying impulses towards the neuron cell body is the
dendrite
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the point where the axon fibers of one neuron come close to the dendrite fibers of the next neuron is called the
synapse
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an important function of the spinal cord is to serve as
the reflex center
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motor neurons have their cell bodies located in the
spinal cord
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some important plexes are found in the
cervical and lumbar regions
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the cerebellum
- concerned with balance and equilibrium
- somatic
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the hypothalamus
- is an important autonomic center
- control of heart, bloodpressure, and tempurature
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the vagus nerve is the
tenth cranial nerve
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the muscles that move the eyeball around are called the
extrinsic eye muscle
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intrinsic eye muscles
are attached to the lens of the eyes
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functions of the nervous system
- stimulus-response system
- what our body does when a stimulus is picked up
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neuroglia cell
- found in the brain and spinal cord.
- function: to fill spaces for structural support
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neurons
- true conducting cells
- cannot divide
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voluntary nervous systm
can fire at wil
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involuntary nervous system
- sympathetic: speeds up
- parasympathetic: slows down
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nerves are
bundles of neurons
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basic structure of a neuron
- dendrite recieve stimulus
- cell body
- axon carry the stimulus aways
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sensory (afferent)
message TOWARDS the brain
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motor (efferent)
message AWAY from the brain
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impulse
message traveling along the nerve and motor neurons together for reflex purposes
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threshold
certain point in order to reach firing level
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all or nothing law
message will keep moving if threshold is met. if not, nothing will send at all.
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synapse
the breakdown between 2 neurons
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function of the spinal cord
neural pathway for impulses going to thebrain. reflex center
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structure of spinal cord
- pia matter, arachnoid, durra matter
- PAD
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function of the brain
- interprets incoming sensory info
- initiates MOTOR response
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how many pairs of spinal cords?
31 pairs!
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special senses
- 1. eyes
- 2. ears (hearing and equilibrium)
- 3.olfaction (sense of smell)
- 4. taste
- 5.cutaneous (skin)
- 6. proprioception: awarness of muscles
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