HMB200H1 Lecture Notes - Lecture 1: Pineal Gland, Sensory Cortex, Virtual Reality
Document Summary
The brain: 80 billion neurons, forming 10,000-100,000 connections. Structure/development: developing virtual reality, anatomy and physiology. The nervous system"s function is to produce movement within a perceptual world created by the brain. Rene descartes: inspired by st. germain mechanical statutes in the 1600s. Theorized humans & animals behaved in the same way. Stimuli are vibrate spirits in nerves (hollow tubes) to brain, through ventricles, back down nerves to muscles. Animal soul/spirits through ventricles causes simple behaviors/reflexes (materialism=fixed) Rational soul (in pineal gland) can modify movement behaviors (spiritualism=can. Chemical transmitter than the axon terminal releases at the muscle end plate. Channels open, allowing na+ and k+ ions across muscle membrane to depolarize muscle to the threshold. Muscles then generate action potentials to contract. 1. fibers entering dorsal root being sensory information from sensory receptors. 2. fibers leaving ventral root carry motor information to muscles. 3. collateral branches of sensory neurons may cross the other side and influence motor neurons there.
