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.
carotid bifurcation. the division of the common carotid artery into internal and external carotid arteries; it occurs at the level of the superior border of the thyroid cartilages (vertebral level C4), The carotid body and sinus occur in relation to the carotid bifurcation.Synonym(s): bifurcatio carotidis [TA].he division of the common carotid artery into internal and external carotid arteries; it occurs at the level of the superior border of the thyroid cartilages (vertebral level C4), The carotid body and sinus occur in relation to the carotid bifurcation. Synonym(s): bifurcatio carotidis [TA].