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Nervous System
process and respond to internal and external stimuli…
Nervous System
process and respond to internal and external stimuli (changes in environment) by connecting sense organds to muscles/glands through CNS, organize, memorize/store
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Nerves
(connect the sense organs/receptors, CNS, and muscles and glands - effectors)
Electrical impulses (within neuron from one end to another)
Neurotransmitters across synapse between two neurons
3 types:
afferent (sensory),
efferent (motor) and
relay neurons
Parts of a neuron:
synapse,
axon,
dendrite,
myelin sheath,
nucleus
Central Nervous System
(receives info from sense organs, collects and decides the response)
12 cranial nerves connect to CNS through ganglia
trigeminal (jaw, mastication, face)
vagus (heart & respiratory rate, acid secretions in stomach, intestinal peristalsis
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hypoglossal (tongue, neck)
glossopharingeal (tongue, tastebuds, swallowing)
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eye (trochlear, abductent, ocular motor)
facial nerve (face, tastebuds)
Spinal cord
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Brain: 2% body weight, 20% oxygen
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Difference between ganglionic neuron versus nerve, plexus
Reflex responses