From about 26 weeks you can talk about there being a complete system in terms of biology, a link from the skin to the spinal cord to the brain, and we know that set-up is reasonably functional.  -   Stuart Derbyshire     Quotes
From about 26 weeks you can talk about there being a complete system in terms of biology, a link from the skin to the spinal cord to the brain, and we know that set-up is reasonably functional. Stuart Derbyshire