Ossification is the process of bone formation, in which connective tissues, such as cartilage are turned to bone or bone-like tissue. The ossified tissue is invaginated with blood vessels. These blood vessels bring minerals like calcium and deposit it in the ossifying tissue. It is thought that this process led to bone as a structural element in vertebrates. Minerals were deposited in cartilage, which was used for storage. Bone was thus an exaptation from the ossified cartilage. Grays illustration of a human femur, a typically recognized bone. ... Cartilage is type of dense connective tissue. ... Grays illustration of a human femur, a typically recognized bone. ... Minerals are natural compounds formed through geological processes. ... General Name, Symbol, Number calcium, Ca, 20 Series alkaline earth metal Group, Period, Block 2 (IIA), 4, s Density, Hardness 1550 kg/m3, 1. ... Grays illustration of a human femur, a typically recognized bone. ... Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Minerals are natural compounds formed through geological processes. ... Cartilage is type of dense connective tissue. ... An exaptation is a biological adaptation where the biological function currently performed by the adaptation was not the function performed while the adaptation evolved under earlier pressures of natural selection. ... Cartilage is type of dense connective tissue. ...
Ossified posterior longitudinal ligament was seen at C 4/5 level (Fig.
On axial sections, the ossified posterior longitudinal ligament is seen as a ’mushroom’, a ‘hill’, and a ‘square’ or a mixture of these shapes.
And a characteristic sharp radiolucent line separates the ossified posterior longitudinal ligament from the posterior vertebral margin representing the unossified deep component of posterior longitudinal ligament [4].
The body and vertebral arch are ossified in the same manner as the corresponding parts in the other vertebræ;, viz., one center for the body, and two for the vertebral arch.
The base of the process is separated from the body by a cartilaginous disk, which gradually becomes ossified at its circumference, but remains cartilaginous in its center until advanced age.
In this cartilage, rudiments of the lower epiphysial lamella of the atlas and the upper epiphysial lamella of the axis may sometimes be found.
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