Peripheral Nervous System

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Presentation transcript:

Peripheral Nervous System All of the nerves of the body and ganglia Autonomic nervous system is a specialized part of the PNS

Divisions of the Nervous System

Cranial Nerves Cranial Nerves 12 pairs Begin in the brain Designated by number and name

Spinal Nerves Spinal Nerves Originate at spinal cord and go through openings in vertebrae 31 pairs of spinal nerves All are mixed nerves Named in relation to their location on the spinal cord.

Autonomic Nervous System Regulates activities of visceral organs Not subject to conscious control

SNS and PNS Sympathetic Nervous system the “fight or flight” system when the body perceives danger, SNS sends a message to adrenal medulla to secrete adrenaline heartbeat increases. Parasympathetic nervous system counters effect of SNS decreases heart rate

Definitions Reflex-unconscious and involuntary In a simple reflex, only a sensory nerve and motor nerve involved – example, “Knee-jerk” reflex. Using a reflex hammer tap the patellar tendon (on knee) what happens?

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