But the cerebral cortex — the part of the brain that has thoughts, stores memories, and controls voluntary muscle movement — only kicks into gear after encountering the world outside the womb. (babycenter.com)
Motor neurons, which are important for voluntary muscle movements, have long been known to release acetylcholine onto both muscle cells in the body and neurons in the spinal cord. (scientificamerican.com)
SMA is typically marked by the degeneration of voluntary muscle movement including the muscles that control crawling, walking, swallowing or breathing. (smafoundation.org)