The Skeletal System is subdivided into two divisions, the axial skeleton which is the bones that form the longitudinal axis of the body and the appendicular skeleton which is the bones of the limbs and girdles. The skeletal system includes joints, cartilages and ligaments. In the Skeletal System it includes the oseton. The oseton consist of central canal and matrix rings. Central canals run lengthwise through the bony matrix, carrying blood vessels and nerves to all areas of the bone.
If you didn't know the adult skeleton is composed of 206 bones. Bones are classified according to shape into four groups: long bones, short bones, flat bones and irregular bones. Long bones are typically longer than they are wide. Long bones are mostly compact bones and ll the bones of the limbs except the wrist and ankle bones are long bones. Short bones are generally cube-shaped and contain mostly spongy bone. The bones of the wrist and ankle are short bone. Flat bones are thin, flattened and usually curved. They have thin layers of compact bone which is an layer of spongy bone between them. Irregular bones are bones that do not fit one of the preceding categories.
divisions of the skeletal system
Axial skeleton: The axial skeleton (80 bones) is formed by the vertebral column, the rib cage, and the skull. The upright posture of humans is maintained by the axial skeleton, which transmits the weight from the head, the trunk, and the upper extremities down to the lower extremities at the hip joints. The bones of the spine are supported by many ligaments. The erectors spinae muscles are also supporting and are useful for balance. A human is able to survive with just the axial portion of their skeleton.Appendicular skeleton: The appendicular skeleton (126 bones) is formed by the pectoral girdles, the upper limbs, the pelvic girdle or pelvis, and the lower limbs. Their functions are to make locomotion possible and to protect the major organs of digestion, excretion and reproduction.
functions of the bones
Support: Bones, the steel girders, and reinforced concrete of the body form the internal framework that supports and anchors all soft organs
Protection: Bones protect soft organs.
Movement: Skeletal muscles attached to bones by tendons, use the bones as levers to move the body and it's parts. The skeletal system provides support and protection while allowing movement.
Storage: Fat is storaged in the internal cavities of bones. Bones itself serves as a storehouse for minerals.
Blood cell formation: blood cell formation or hematopesis occurs within the marrow cavity.
Protection: Bones protect soft organs.
Movement: Skeletal muscles attached to bones by tendons, use the bones as levers to move the body and it's parts. The skeletal system provides support and protection while allowing movement.
Storage: Fat is storaged in the internal cavities of bones. Bones itself serves as a storehouse for minerals.
Blood cell formation: blood cell formation or hematopesis occurs within the marrow cavity.
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Mastoiditis is an infection of the mastoid bone of the skull. The mastoid is located just behind the ear.
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- Scoliosis is an abnormal lateral curvature of the spine. Most of the time the cause of scoliosis is unknown, which is called idiopathic scoliosis. It is the most common type.
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A dislocation is an injury to a joint where two or more of your bones come together. In which the ends of your bones are forced from their normal positions.