PS263 Lecture Notes - Lecture 7: Neuromuscular Junction, Myocyte, Motor Neuron
Document Summary
Muscle simply relaxes when it receives no message to contract. Moving a leg/arm back and forth requires opposing sets of muscles . @ elbow flexor muscle brings hand toward shoulder; extensor. Central pattern generators neural mechanisms in the spinal cord that. Stimulus that activates cpg does not control the frequency of the generate rhythmic patterns of motor output alternating movements. Cells in the lumbar segments of the spinal cord generate this rhythm and continue even if isolated from the brain or if the muscles are paralyzed. Researchers have identified neural mechanisms of excitation and inhabitation that produce these rhythms. Motor program - fixed sequences of movements. Human have built in motor programs yawns, facial expressions such as smiles, frowns and raised eyebrow greetings. Even in our voluntary behaviors have a surprising degree of regularity and predictability. One goal to help people who have spinal cord damage or limb amputations. Connected electrodes to primary cortex to a robotic arm.
