All of the nerves of the body and gangliaAutonomic nervous system is a specialized part of the PNS

Cranial Nerves 12 pairs Begin in the brain Designated by

number and name

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.

Regulates activities of visceral organs

Not subject to conscious control

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

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?

Somatic Nervous System

Part of the peripheral nervous system Carries motor and sensory

information both to and from the central nervous system

Connects skin to sensory organs and all skeletal muscles

Hearing Touch sight

Nervous Tissue

Bundle of nerve fibers Sensory nerves (afferent) carries

impulses from skin To sense organs, to spinal cord and

brain.

Motor Nerves(efferent)

Carry messages from the brain and spinal nerves to muscles and glands.

Associative neurons (interneurons) carry impulses from

sensory neurons to motor neurons.

Questions for PPT and BM three

On the bubble map draw each of the pictures and discuss what each of the picture means related to the central nervous system.

Each picture should be in color

Remember to color the bubble map and write in color.

Make sure the questions cover the entire page.