LIFESCI 2 Lecture Notes - Lecture 7: Schwann Cell, Brodmann Area, Homeostasis
Document Summary
Skin receptor->interneuron in spinal cord-> effector (muscle) Afferent- all the sensation, hearing, seeing, touch, taste, smell, temperature, chemical (o2, co2), hunger, Heart beat speeds up, breathing rate speeds up. Only under the control of one or the other, not both. Can initiate activity (breathing) or regulate activity (heart rate, doesn"t make heart beat though) Ensure neurons are getting the correct nutrients. Release important fluid to go inside brain and around brain. Between brain and skull so that brain floats inside skull. Bathes, nourishes brain, acts as shock absorber. Help in protecting, take away any unwanted chemicals/debris. Many more glial cells than neurons, ratio is about 10:1 glial cells to neurons. Main function is to support the brain. Every part is responsible for a specific function. Size doesn"t matter, amount of synapses that form is what matters. In learning we see more synapses forming. Connection constantly change even though number of synapses may remain.
