Anatomy, descriptive and applied. by H. Gray

By H. Gray

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To be composed of fibres and granular cells in a matrix. The outer portion is more fibrous, while internally the cells or osteoblasts predominate; the whole At the outset of the process of bone formation a little network of bony tissue is quite vascular. When these rays of spicules is first noticed radiating from the point or centre of ossification. of proliferation. 7C. Zone of calcificaca. Cartilage. ) tion, Zone Union q adjacent V ^^^iT^ Fig. 10, — Part of the grow " Bony ng edge of the developing parietal bone of a fetal cat, spicules.

They are usually developed from separate centres of ossification termed epiphyses, and consist of cancellous tissue surrounded by a thin layer of compact bone. The long bones are not straight, but curved, the curve generally taking place in two planes, thus affording greater strength to the bone. (35) The 36 GENERAL ANATOMY OF THE SKELETON this class are the clavicle, humerus, radius, uhia, femur, tibia, metacarpal and metatarsal bones, and the phalanges. Short Bones. Where a part of the skeleton is intended for strength and compactness, and its motion is at the same time slight and limited, it is divided into a number of small bones united by ligaments, and the separate bones are short and compressed, such as the bones of the carpus and tarsus.

Embryonic connective-tissue cells of the mesoMembrane may become blast develop membrane. bone directly or cartilage may be deposited, which cartilage by the process of ossification is changed into bone. The tissue which is eventually to become bone contains cellular elements which evolve into osteoOsteoblasts exist in the blasts, or bone-forming cells. connective tissues which become bone by intramembranous ossification, and in the deeper layers of the tissue called perichondrium which invests cartilage and which becomes the osteogenetic layer of the periosteum.

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