01:830:331 Lecture Notes - Lecture 2: Central Nervous System, Homo Erectus, Axon Terminal
24 Jul 2016
School
Department
Course
Professor
Document Summary
~homo erectus left africa and went to europe/asia. ~homo sapiens evolved in east africa 100,000 years ago. ~bipedalism limits how big the pelvis can get, so when babies are born their heads are not fully developed, so that they can come out in one piece. ~neurons in newborn are not very specialized, adults/environment influences their development. ~for other animals, brain size does not increase significantly with weight, but human brains are hug. ~and we also have higher neuronal density in brain. Though new neurons don"t really form, the connections between them develop and grow. ~interneurons are entirely in cns and are in between sensory and motor neurons. ~relay interneurons connect circuits in different brain regions. ~estimated that there"s ~100 billion neurons in the nervous system. Central nervous system (cns) any cell that is fully incased in skull or spinal column. Peripheral nervous system (pns) any cell that is even partially outside brain/spinal cord.
