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
Alan (given name) Alan (given name) Alan is a masculine given name in the English language. There are numerous differing etymologies attributed to the name. The name was first introduced into England by Bretons who took part in the Norman Invasion in the 11th century. Today there are numerous variations of "Alan", a short form, and there are also numerous feminine forms of the name as well. "Alan" has many forms in other languages. "Alan" is also an Old Breton personal name (from which the modern English "Alan" is ultimately derived), as well as being a Norman French name. "Alan" is a masculine