Though it is not strictly part of the usual diarthrodial joints, the structure of the intervertebral discs is shortly presented as its pathology is very common problem. Two main parts of the intervertebral discs are the outer ring (annulus fibrosus) and the inner gelatinous material.
In Australia, Ireland, New Zealand and Britain, the term timber describes sawn wood products, such as floor boards. In the United States and Canada, generally timber describes standing or felled trees, before they are milled into boards, which are called lumber.n the United Kingdom, the word lumber is rarely used in relation to wood, and timber is almost universally used in its place; but lumber has several other meanings in Britain, including unused or unwanted items.
Varieties of hardwood lumber are the staple materials for the woodworker, particularly those who focus on fine woodworking projects such as furniture. However, the term hardwood can be a bit deceiving, as it has less to do with the hardness of the material than the species of the tree from which the lumber is harvested. Hardwoods come from deciduous, or broad-leaved trees, as opposed to softwoods, that are harvested from from evergreens. 1  In general, the lumber derived from hardwood species are typically harder than softwoods, although there are exceptions (balsa wood is very light and soft, but is considered a hardwood).