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
Don (given name) English language. Don (given name) Don is a masculine given name in the Irish language and a short form of another masculine given name in the English language. The Irish name is derived from the Irish "donn"; the name can either mean "brown", or "chief", "noble". The Irish name is a variant spelling of "Donn". The English name is unrelated to the Irish name; this name is a short form of the given name "Donald". Pet forms of this English name include: "Donnie" and "Donny". It can also be a surname, also derived from "brown". It is a common name