1. Brain
As you might imagine, larger animals have larger brains. However, this does not mean that animals with larger brains are smarter than animals with smaller brains. For example, a larger brain is necessary to control larger muscles in larger animals and a larger brain is necessary to process more sensory information from the skin in larger animals - this has nothing to do with intelligence.
Possible human ancestor lived 3 million years ago..
Female, little under 4 feet, apelike head, protruding jaw, uneven teeth,
Skull held brain roughly 1/3 the size of modern day humans
1/2 million years ago…Homo erectus (man, upright) brain size doubled that of Lucy’s.
HomoSapien: Wise Human Our species began about 400,000 years ago.
Two possible explanations for brain size change. Accidental changes in gentic instructions and natural selection which means that only those best fitted to their environments will survive.
Braintastic!

2. How Neurons Communicate: The Neural Chain
The Nervous System and the Endocrine System

3. A Neural Chain

4. Receptor Cells
Specialized cells in the sensory systems of the body that can turn other kinds of energy into action potentials (neural impulses) that the brain can process
Receptor cells in the eye turn light into a neural impulse the brain understands.

5. Sensory Nerves
Nerves that carry information from the sensory receptors to the spinal cord and brain.
Connect the sense organs to the brain and spinal cord

6. Interneurons
Nerve cells in the brain and spinal cord responsible for processing information
Related to sensory input and motor output

7. Motor Nerves
Nerves that carry information from the brain and spinal cord to the muscles and glands.
Carries messages from the brain and spinal cord to other parts of your body

8. The Structure of the Nervous System

9. Divisions of the Nervous System

10. Divisions of the Nervous System (of a Car)

11. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

12. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

13. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

14. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

15. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

16. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

17. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System