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SKELETAL SYSTEM 469624-16423-36 (Histology of bone (BONE CAVITIES- the…
SKELETAL SYSTEM 
Types of bones and functions
Flat bones - Example: Parietal bone (To protect internal organs such as brain)
Long bones-Example: Femur and Humerus bones (To support the weight of the body and facilitate movement.)
Short bones- Example: the carpals in the wrist such as scaphoid and trapezium (To provide stability and some movement)
Irregular bones-Example: verterbrae (Protect the internal organs such as spinal cord)
Sesamoid bones-Example: Patella (To protect tendons from stress and wear.
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Histology of bone
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Lamellar bone
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Osteons consist of concentric lamellae of bone matrix surrounding a central canal, the Haversian canal, which contains the vascular and nerve supply of the osteon
PERIOSTEUM-An outer fibrous sheath of dense regular connective tissue covering of the bone except articular surface
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Immature bone-the skeleton of developing fetus(areas of immature bones are present in adults especially where bone is being remodeled such as in the alveolar sockets and where tendons insert into bones.
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Cells of bone tissue
3.Osteocytes-Responsible for maintaining the bone matrix(synthesize new matrix, participate in matrix degradation and maintain calcium homeostatis
4.Bone-lining cells-(maintenance and nutritional support of the osteocytes and regulate the movement of calcium and phosphate into and out of the bone.
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5.Osteoclasts-bone-resorbing cells present on bone surfaces where bone is being removed or remodeled.
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