PS263 Chapter Notes - Chapter 8-9: Dorsal Root Of Spinal Nerve, Thalamus, Prosthesis
Document Summary
Vision scientists like to boast that 30-40% of the primate brain is involved in visual processing. But motor scientists can boast that ~50% of the primate brain is involved in motor processes. = selectively toxic to dopaminergic cells: mptp has been used in animal models of parkinsonism. Muscle contraction= the basis of all movements. Alpha motor neurons in the spinal cord communicate with muscle bers by releasing acetylcholine, which in uence muscle activity by causing muscle contractions. An electromyogram(emg) is recorded from electrodes placed on the skin over the muscle to measure electrical activity produced by the ring of alpha motor neurons. Antagonist pairs of muscles (extensors s exors) span most of our joints: ex: biceps vs triceps. The synapse where a motor neuron"s axon meets a muscle ber = neuromuscular junction. Affector: carries neural impulses to cns (sensory) Effector: receives neural impulses from cns (motor) Muscles are activated by the alpha motor neurons.
