Kinesiology 3480 Lecture Notes - Lecture 13: Alpha Motor Neuron, Parietal Lobe, Perseveration
24 Oct 2017
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Document Summary
In monkeys, damage to sma produces deficits in bimanual coordination. Important motor region of the cortex, sends output partially to the corticospinal pathway and the m1. Direct projections associated with sma to corticospinal pathway terminate on alpha motor neurons that innervate hands and fingers for fine motor control. Have a very specific way to activate and when they activate. Thought to be primarily active for internally generated activities. When you are planning to move, you make an internal commitment to move which is when the sma neurons will be active and mediate. These neurons fire in a sequence specific fashion (eg. typing to hit key strokes) this is the type of task mediated via sma neurons. One finger is relative to the other finger, how to mediate the sequence in fingers is via sma to direct corticospinal projections mediating hand and finger musculature. Sequenced specificity, mri scanner to tap their finger, compare tapping finger versus tapping a complex numerical sequence.
