1. Human Nervous System Most Remarkable Communication Center
Regulates the actions of organs
Monitors the senses
Controls one’s thinking, learning & memory capacity
Specialized nerve receptors in sensory organs of eyes, ears, nose
Constantly send data to brain at 300 mph

2. February 2, 2010 New Notebooks… Get ‘er done!!
Please turn to page 973
Draw a neuron on the left side… Label it please…
Notes 36.1

3. Nervous System!!
Chapter 36

4. Neurons – nerve cells which conduct impulses thru/out body - can be 1 m long in humans
Composed of 3 parts:
1. Cell body – contains the nucleus, interprets
2. Axon – carries impulses away from the cell body
3. Dendrite – receive stimuli and conduct towards the cell body
Synapse – space that separates neurons from each other, a chemical neurotransmitter is released that bridges the gap and is unidirectional

5. 1. The basic unit of the nervous system = neuron?
Dendrites receive stimuli
Nerve cell body
@ nucleus transmits the stimuli
Axon transmits the impulse to another dendrite

6. myelin - covers the axon (white matter) allows impulse to “jump”
Resting neuron has a polarized membrane “– “ inside the cell, “+”outside the cell,
that can transmit an electrical charge or impulse
Depolarization - increase in Na+ inside cell give it a positive charge (wave) moves at speeds > 130m/sec
myelin - covers the axon (white matter) allows impulse to “jump”
gray matter - found in CNS brain, spinal cord

7. Axon ending: terminal bud
Transfers the electrical nerve impulse
By chemical neuron-transmitters
From one neuron to the next

8. Nerve depolarization is all or none principle

9. What is the function of the nervous system?
To receive
information from
a sensory neuron
To process
info by the
brain & spinal cord
To respond by an
effectors (muscle/gland)

11. The Central Nervous System:
1) Spinal Cord
2) Brain
medulla for
breathing
cerebellum for
balance
cerebrum for
higher thinking bw

12. Central Nervous System (CNS)
Central Nervous System (CNS) - brain and spinal cord, receives and processes info and makes appropriate response
1. Cerebrum - 2 hemispheres, intelligence, memory, verbal, language, senses, “bridge connection”
2. Cerebellum - controls balance, posture, coordination
3. Medulla Oblongata – involuntary responses like heartbeat, breathing

13. Right versus left Cerebrum

14. Peripheral Nervous System
Peripheral Nervous System (PNS) - all nerve pathways from the CNS to rest of body
1. Somatic Nervous System – voluntary system, connection between spinal cord cranial & spinal nerves, skin
Reflex - automatic response to a stimulus, sensory neurons, spinal cord, motor neurons

15. R-SIM Reflex arc pathway . . .
receptor neuron receives the stimuli S
sensory neuron passes the impulse on I
interneuron at the spinal cord processes M
motor neuron acts

16. Autonomic Nervous System
2. Autonomic Nervous System - carries impulses from the CNS to internal organs, involuntary controlled by the hypothalamus (BP, stomach movements, body temp, homeostasis)
a. Sympathetic Nervous System -
fight or flight
b. Parasympathetic Nervous System –
rest/relaxing

17. The Autonomic Nervous System

18. Sensory neurons or“receptors” receive a stimulus from:
eyes - sight
ears - hearing
nose - smell
skin - touch
mouth - taste