We had to learn all the different patterns of limb anatomy, skull anatomy, the transition of the ear ossicles from the old quadruped armored skull plate. We had to learn the different patterns of teeth and what they represented, and why a biologist could give you a reasonable time frame of when the creature lived or what kind of animal it belonged to, just by seeing a few teeth with the remaining fossil. He made you memorize ever order in the vertebrate clade (did you know dolphins are more closely related to cows than people? I did now!) and their relationships. He taught my favorite class I've ever had in my life: Comparative Vertebrate Morphology. So he's naturally unkempt, and his office is a paper factory after a tornado. The Strength of Great Apes and the Speed of Humans. As a result, chimps often end up using more muscle than they need." So using a muscle becomes more of an all-or-nothing proposition for chimps. On the other hand, since chimps have fewer motor neurons, each neuron triggers a higher number of muscle fibers. We can engage just a few muscle fibers for delicate tasks like threading a needle, and progressively more for tasks that require more force. Our surplus motor neurons allow us to engage smaller portions of our muscles at any given time.
Spinal grey matter contains large numbers of motor neuronsnerves cells that connect to muscle fibers and regulate muscle movement. MacLarnon showed that, relative to body mass, chimps have much less grey matter in their spinal cords than humans have. Walker's hypothesis stems partly from a finding by primatologist Ann MacLarnon. But evolutionary biologist Alan Walker, a professor at Penn State University, thinks muscles may only be part of the story. "Biologists have uncovered differences in muscle architecture between chimpanzees and humans. We make our world significant by the courage of our questions and by the depth of our answers. For more open-ended questions, try /r/AskScienceDiscussion | Sign up to be a panelist!.Looking for flair? Sign up to be a panelist!.
#Shaved chimpanzee muscles software#
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