Race the pathway from receptor to brain (sensory) or brain to effector (motor). You want to tell your right biceps femoris to contract. Put the steps in order. 1. Right primary motor cortex 2. Upper motor neuron descends through the brain to the left side of the medulla oblongata 3. Decussation at pyramids to the right side 4. Upper motor neuron synapses with the lower motor neuron at the right anterior horn 5. Right anterior rami L4-S4 6. Right spinal nerves L4-S4 7. Right sacral plexus 8. Right sciatic nerve 9. Right biceps femoris 10. Right anterior roots L4-S4 (right side)
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