Comd 5070 Final Exam Study Guide 2024

EMG and Electrode Type (Surface vs. Intramuscular Recordings) {Ans: EMG is an Indirect way of studying movements. Study of electrical activities in muscles. -Motor neurons innervate muscles. -Motor units consist of - a motor neuron -a few or many muscle fibers -muscle contraction follows neural stimulation -electrical activity measured during contraction -powerful amplifier so it can be recorded bw 1000 and 10,000 -Electrical stimulation of muscles causes contraction -antagonist muscle opposing the movement so it may not be easily predictable. -link bw EMG & movement is not simple -many researchers measure EMG & movement (motion of limbs) simultaneously. -Timing can be very valuable. -We can LEARN what the brain CNS from axon has told the muscle to do. -EMG data can be complicated. Shows muscles have different goals from different control area. Electrode Types - 1. Intramuscular Electrode (invasive): For FINE detail or muscle activity. -inserted into muscle, so it can measure electrical activity. When laryngeal EMG activity measure wanted, need to record activity of very small & very inaccessible muscles; like thryoArytnd, cricothyroid, lateral cricAryt, have to insert electrode. Usually inserted electrode by hypodermic needle, tiny hook-wire electrode thru skin into laryn, & into these muscles in order