The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma (state of matter) interwoven with magnetic fields. It has a diameter of about 1,392,000 km, about 109 times that of Earth, and its mass (about 330,000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System. Scientists calculate our Sun and solar system formed at the same time - a whopping 4.56 billion years ago.
Definition of crural. : of or relating to the thigh or leg; specifically : femoral crural artery.
Neurogenic claudication is a syndrome, or collection of symptoms, associated with degenerative spinal stenosis in the lumbar spine. It is often related to posture. The combination of the stenosis with certain back postures such as arching puts pressure on lumbosacral nerve roots and/or the cauda equina. (The cauda equina -- which means horse's tail -- is a loose bundle of nerves resembling a tail. The cauda equina extends below the main part of the spinal cord. Lumbar spinal stenosis is common in middle aged and elderly people; it generally takes a long time for the stenosis to develop and the symptoms of neurogenic claudication to appear.