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She did not knock. She pressed her palm flat against the wood. That was a sensory act: pine, cool, grain . Then she turned the knob. That was a motor act: flexion, opposition, force .

Manage the muscles of the chest, upper back, and abdomen.

Her husband, Leo, sat across the dinner table. Between them, invisible as air, were thirty-one nerve pairs—the spinal roots that bundle motor and sensory fibers into the same narrow channel. In anatomy, a nerve pair is a marvel: two currents, opposite in direction, running side by side. One carries command from the brain: move . The other carries feeling from the world: heat, pain, softness, fear .

Provides sensory information from the tailbone area. How These Pairs Function

That was a lie. She was not tired. She was severed .