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The skeletal system is the 'set of bones, cartilage and joints of the body.

The bones are formed by two particular connective tissues: the bone mass is formed by a strip in which contains some special cells called osteocytes, which are distributed concentrically around a thin channels, the channels of Havers in which blood vessels pass.

The bone is divided into two categories:

• spongy bone tissue, in which thin strips intersect each other defining small cavities in which there is bone marrow;

• The compact bone tissue, in which the slats are close to each other

The cartilage tissue or cartilage is formed by a dense intercellular substance and very rich collagen, which are surrounded by groups of spherical cells called chondrocytes. This fabric is not crossed by blood vessels and nerves, accounting for 60% water. The bones are divided into three categories:

• The flat bones are mainly developed in length and width, with a relatively smaller thickness. They consist of two layers of compact bone tissue in which a layer of more or less spongy bone.

• court bones are developed in an almost equal in length, width and thickness. They consist of a spongy bone covered a layer of spongy bone covered with a layer of compact bone tissue.

• The long bones have grown in length. Long bones are the humerus, femur and tibia.

The long bones are formed from a longer part, called the shaft ends on both sides with two lumps called epiphyses. All 'inside of' passing the bone marrow or bone marrow.

include a bone el 'are another special called joint or joints, in fact, of the joints.

According to the movement joints are of three types:

• Fixed: not allow any movement (the sutures of the skull)

• semi-mobile: they allow partial movements (semi-mobile joints are those which are between one vertebra and the other of the spine)

• Furniture : allow large movements. The contact surfaces of the bones are covered with cartilage and not united, but put together and held by fibrous ligaments and a sleeve, the joint capsule which is lined by the synovial membrane that secretes synovial, lubricant of 'articulation.

The skeletal structure is divided into three parts: the skeleton of the head skeleton of the limbs, limb bones, the skeleton of the trunk.

The skeleton of the head is divided into:

• skull: flat bone formed by tightly joined together by sutures which prevent the 'brain.

• facial skeleton: the task of protecting the most important facial organs. It consists of small bones and all different. They are all fixed except the mandible, the only mobile bone of the head.

The skeleton of the trunk is formed by:

• spine: a set of vertebrae connected by an intervertebral disc. Each vertebra consists of the vertebral body and an arched back, the 'vertebral arch. It starts two calls transverse and spinal apophyses. Among the 'arch and vertebral body there is a hole, the hole in the spine, which, together with other fora, forms the spinal canal to' what goes inside of the spinal cord. The spine is divided into: cervical, dorsal or thoracic, lumbar, sacral, and coccygeal.

• The rib cage protects the heart and other major organs of the body. It is composed of ribbon-like bones called ribs: the first twelve of them ribs are true, the following seven are welded to a flat bone, the sternum and the other three are called false ribs because they join the sternum by cartilage prolongations. The last two are called floating ribs because they do not join anything.

The skeleton of the limbs, finally, is divided into;:

• skeleton of the upper limbs: attaches to the skeleton of the trunk by means of two flat bones: the scapula and clavicle, which, together, form the shoulder girdle.

• Skeleton of lower limbs: is joined to the skeleton of the trunk by three bones: the 'ilium 's ischium and pubis, which together form the pelvic girdle, or pelvis. In 'adult pelvis is joined into a single bone.

Source: Observe and experiment, volume C

I apologize for any conceptual errors. Should you find one please write on the comments and I'll be happy to correct text!

Thanks. The Town.