Geographic Range. The original range of Canis lupus consisted of the majority of the Northern hemisphere -- from the Arctic continuing south to a latitude of 20Â° S, which runs through southern Central Mexico, northern Africa, and southern Asia.
Disc desiccation is an extremely common degenerative change of intervertebral discs. The incidence climbs with age, and to a large degree a gradual desiccation is a 'normal' part of disc aging. It results from replacement of the hydrophilic glycosaminoglycans within the nucleus polposus with fibrocartilage.
Desiccation causes the nucleus to lose its ability to rehydrate, so the entire disc structure slowly deteriorates over time. The annulus becomes brittle and may develop small cracks or holes, called annular tears.As the desiccation progresses, the disc may herniate, but this is not inherent or unavoidable.hen discs desiccate, they dry out and shrink, losing mass, circumference and diameter. While this process is completely normal and expected in all humans as we age, it has been vilified by the back pain industry and is often implicated as a primary or secondary source of pain in many diagnosed patients.