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Lecture 3. Neuroanatomy

Lecture 3. Neuroanatomy - CHAPTER 3 Neuroanatomy The...

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CHAPTER 3 Neuroanatomy: The Anatomy of the Nervous System General Layout o CNS= brain and spinal cord o PNS = everything else Spinal Nerve o 8 Cervical o 12 thoracic o 5 lumbar o 5 sacral Major Differences o PNS= has more regeneration ability after damages o CNS= damages are more permanent PNS comprised: o Somatic nervous system Processes aspects of external environment-sensory input and reactions Voluntary processes o Autonomic Nervous system Involuntary functions of body Parasympathetic Dominates at time of rest, relaxation Acts to conserve energy Responsible for vegetative function(involuntary body functions) Sympathetic Brain Dominates during stress/emotional arousal Fight or flight responses (eg. Increases heart rate, decreases digestion) Butterflies in the stomach, etc. Two kinds of nerves based on direction they carry info Afferent : approach CNS (in) Efferent : exit CNS (Out) o Cranial Nerves: of the PNS (12 cranial nerves total) Optiv nerve – vision Olfactory nerve – smell Vagus nerve – from gut and throat (both sensory and motor mediation) o
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