Physiology 3120 Lecture Notes - Lecture 9: Biceps, Extrafusal Muscle Fiber, Gamma Motor Neuron

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The idea to make a movement starts at the cerebral cortex and goes to the basal ganglia or the cerebellum. It is projected to thalamus that then goes to motor cortex or supplementary motor cortex. Then to spinal cord and through alpha/gamma mns to limb mns and then there is muscle contraction. These pathways are in parallel and in series. In parallel would be a split in the pathway where info goes through both routes at the same time like from cerebral cortex to basal ganglia and cerebellum. In series would be a continuous pathway where info goes through one route from one area and then the next area like motor cortex and then to spinal cord and then to limb motor neuron. Muscle receptors can send afferent feedback that is sent to spinal cord or it can go straight to thalamus or straight to cerebellum.

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