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A&P 1 CH 12-14
Dr. Cutler SU-Nervous Tissue-Spinal Cord/Nerves-Brain/Crainal Nerves
| nervous system | keeps controlled conditions with limits that maintain life |
| central nervous system | brain and spinal cord |
| peripheral nervous system | all the nervous tissue outside of the brain and spinal cord |
| sensory-in; motor-out | CNS |
| PNS components | nerves, ganglia, centric plexus(guts) |
| PNS divisions | somatic & autonomic |
| cranial nerve pairs | 12 |
| spinal nerve pairs | 31 |
| somatic | controls body and is voluntary |
| autonomic | involuntary functions like sweating, heart rate, and flight or fight |
| PNS divisions | sensory & motor |
| sensory | viscera(organs) |
| motor | involuntary |
| sympathetic | fight, freeze, or flight |
| parasympathetic | rest & digest |