NEUR 2600 Lecture Notes - Lecture 2: Encephalization Quotient, Symmetry In Biology, Nerve Net
Document Summary
Cells are not identical throughout the brain, they differ depending on where they are in the brain. Cajal said cells were individual and distinct. I. e. they are not in direct contact with one another. Evolution of the brain: brain gets more complex, brain gets bigger. Nervous system evolution: neurons and muscles, nerve net (anemone, bilateral symmetry (flatworm, segmentation, ganglia (squid, brain (human) Evolution from neurons and muscles to the brain took millions and millions of years. Jerison came up with eq (encephalization quotient) Eq = actual brain size/expected brain size *100. Brain increases at 2/3 your increase in body size. Humans, monkeys and parrots have a high eq.
