28 Jun There are two types of bony tissue: compact and spongy. Bo
There are two types of bony tissue: compact and spongy. Both are with solid bony matrix secreted by osteoblast cells but arrangement of bony tissue with respect to space occupying matrix is different. In bony tissue young osteoblasts or young osteocytes remain arranged in concentric lines: called lacunae. In between rows of cells there are concentric layers of bony matrix: called lamellae. In compact bone such concentric lacunae and lamellae form a small unit called osteon with a microscopic Haversian canal running through its centre. Blood vessels and lymphatic vessels are present inside Haversian canal which respectively provide nourishment to the tissue and drainage. Nerve branches are also present in Haversian canal. Compact bone also called cortical bone forms the shaft of long bones and inside such long bone a well defined marrow cavity remains present. Compared to this marrow cavity in spongy bone is irregular with a mesh work of bony tissue traversing through out. Bony beams of spongy bone are called trabeculae while marrow irregular cavities are called cancelli. Spongy bone is also called trabecular bone/cancellous bone. Spongy bone is present in heads of long bones; it forms all irregular bones including vertebrae girdles etc. and is stronger than compact bone. Moreover red bone marrow is present in spongy bone marrow cavities where blood cells are generated. (https://d2gne97vdumgn3.cloudfront.net/api/file/pTqgibiQ76sV3jyc6n0R)
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