The long bones are a part of the limbs, where they form a system of levers, which have to sustain the weight of the trunk and to confer locomotive power. The short bones: where part of the skeleton is intended to have strength and compactness, and its motion is slight and limited being connected by a number of slight bones connected to ligaments; wherein the separate bones are short, compressed, and spongy throughout. The flat bones lay where the principal requirement is either extensive protectiveness or the provision of broad surface for musculature attachment such as the occipital, parietal, os innominatum, sternum, and patella. The irregular bones are of a peculiar shape that are unable to be placed in either of the three preceding categories and include the processoral vertebrae in all of its antero-posterior completion, the sacrum, coccyx, temporal, sphenoid, hyoid, etc...
Articular eminences lay in structures similar to the head's humerus, and the femur while non-articular depressions are modeled in articulations wherein similarities are noted in resemblance to the glenoid cavity of the scapula.
The spine is a flexuous and flexible column formed by a series of bones called the vertebrae. Each vertebra consists of two essential parts--anterior solid segment or body, posterior segment or arch. The arch is is formed of two pedicles and two laminae, supporting seven processes--viz. four articular, two transverse, and one spinous.
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