Bone
tissue is classified as compact or spongy according to the size and
distribution of the open spaces in the bone tissue. Compact bone tissue is hard
or dense with few open spaces. Compact bone tissue provides protection and
support. Most long bones consist of compact bone tissue. In contrast, spongy
bone tissue is porous with many open spaces. Spongy bone tissue consists of an
irregular latticework of thin needlelike threads of bone called trabeculae
(from the Latin trabs, meaning “beam”). Most flat, short, and irregular shaped
bones are made up of spongy bone tissue.
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