1. The Human Nervous System
Think about it…..

2. Regulation
Along with the ENDOCRINE SYSTEM, which is a system of glands, the nervous system takes part in regulation.
The nervous system’s responses are quicker, but not as long lasting as endocrine responses.

3. Cyton (main part of neuron cell)
Neurons
Are nerve cells
3 Types:
- Sensory neurons
- Interneurons
- Motor neurons
The space
between
two neurons
is called the
synapse
Cyton (main part of neuron cell)

4. Neurons

5. Sensory Neurons
These take impulses from receptors or sense organs. These are:
eyes
nose
ears
tongue
skin
These impulses go to the brain and spinal cord.

6. Motor Neurons
Take impulses from the brain and spinal cord to the EFFECTORS: Muscles or glands

7. Interneurons Take impulses from sensory to motor neurons IN-BETWEEN=

8. Normal Neural Pathway

9. You’ve Got Nerve(s) Nerves: Bundles of neurons or parts of neurons
Types:
Sensory Nerves
Motor Nerves
Mixed Nerves (both of the above combined)

10. Human Nervous System Peripheral Nervous System Central Nervous System
Everything outside of the Central Nervous System
Spinal Cord
Brain

11. The Brain A large mass of neurons with 3 major parts:
1. The Cerebrum: In humans, the largest part. Thought, Learning and memory happen here. It receives/interprets messages from sense organs and initiates all voluntary movements/responses
The Cerebellum: Coordinates all motor activities including balance
The Medulla: Connects the brain to the spinal cord. It controls breathing, heart rate, blood pressure, peristalsis: All involuntary activities

12. cerebrum
gray matter
thalamus
cutaway view
hypothalamus
white matter
pituitary gland
cerebellum
medulla

14. The Peripheral Nervous System
Autonomic Nervous System
The Somatic Nervous System
Follows orders sent by the medulla, controls involuntary systems such as:
Smooth muscle (digestion)___________ex.
Cardiac Muscle (circulation)____________ex.
Glands_________________ex.
Controls all of the nerves of the VOLUNTARY muscles and sensory neurons

15. Habits Learned behavior which becomes automatic through repetition
Nerve pathways for impulses are established with practice
Concert pianists, guitar players, athletes, etc. don’t have to think about every finger placement, footstep, etc.

16. Reflexes Automatic, inborn responses to particular stimuli
The set pathways that impulses follow in reflexes are called Reflex Arcs

17. REFLEX ARC
Doesn’t go

18. Disorders of the Nervous System
Cerebral Palsy: Group of diseases which affects voluntary movement. Caused by damage done to cerebrum usually during embryonic development
Meningitis: Inflammation of the membranes which surround the brain and spinal cord. It can be caused by viral or bacterial infections. Symptoms: Fever, chills, headache, muscle stiffness

19. More Disorders
Stroke: When the brain is damaged as a result of a ruptured blood vessel in the brain called a cerebral hemorrhage, or a blood clot in a blood vessel in the brain
Polio: A viral infection that affects the central nervous system and can cause paralysis. It can be prevented by immunization.