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.
bifurcation. 1. a division into two branches. 2. the point at which division into two branches occurs. Carotid bifurcation: the site of division of the common carotid artery into the external and internal carotid arteries.ifurcation. 1. a division into two branches. 2. the point at which division into two branches occurs. tracheal bifurcation. termination of the trachea, where it divides into two principal bronchi.