Vertebral column and sacral curvatures) form during fetal development. The secondary curves develop after birth. The cervical curvature forms as a result of lifting the head and the lumbar curvature forms as a result of walking. The vertebral column surrounds the spinal cord which travels within the spinal canal, formed from a central hole within each vertebra. The spinal cord is part of the central nervous system that supplies nerves and receives information from the peripheral nervous system within the body. The spinal cord consists of grey and white matter and a central cavity, the central canal. Adjacent to each vertebra emerge
Douglas (given name) "Douglas" is derived from the Gaelic elements: "dubh", meaning "dark, black"; and "glas", meaning "stream" (also a derivative of "glas", meaning "green"). The surname "Douglas" is a habitational name, which could be derived from any of the many places so-named. While there are numerous places with this name in both Ireland and Scotland, it is thought, in most cases, to refer to Douglas, South Lanarkshire, which was once the stronghold of Clan Douglas. The Scottish Gaelic form of the given name is ; the Irish language form it is , and "Dubhghlas", which are pronounced . The Hawaiian language form