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The human body is separable into the head, the trunk and the limbs. The bones form the skeleton or a bony framework of the body. The most important part of the skeleton is the backbone or the spinal column formed by vertebrae. There are cervical, thoracic, lumbar, sacral vertebrae and from 1 to 5 vertebrae in the coccyx.The upper part of the skeleton is the skull. It consists of facial and cranial parts made up of 26 bones. The brain is located inside the skull. A freely movable bone forms the lower jaw.The trunk includes the chest or thorax, and the ab¬domen. The diaphragm divides the trunk into two cavities — the thoraсic and abdo¬minal cavities.Twelve pairs of ribs, twelve thoracic vertebrae and the breastbone form the chest (thorax).There are two pairs of limbs (extremities) - the upper limbs, or arms, and the lower limbs, or legs. The upper arm, the forearm, the wrist and the fingers are in the upper limb. Shoulder girdle connects the arms with the body. The thigh, the leg and the toes are in the lower limb. Pelvis connects the lower extremities with the body.All bones are bound together, but their large number allows the wrist to bend freely. Joints, cartilages and ligaments connect the bones of the skeleton. The bones consist of organic and inorganic substance. The whole body is bilaterally symmetric.
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