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What Are Muscles?

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The term joint refers to an anatomical structures in which two or more bones are touching. A joint or articulation (or articular surface) is the connection made between bones in the body which link the skeletal system into a functional whole. In all joints, the bones are kept from grinding against each other by a lining called cartilage. Bones are joined to bones by strong, elastic bands of tissue called ligaments. Muscles are connected to bones by tough cords of tissue called tendons. Muscles pull on tendons to move joints. Strong muscles help support and protect joints where bones meet.

They are constructed to allow for different degrees and types of movement .They are able to withstand compression and maintain heavy loads while still executing smooth and precise movements. All of your bones, except for one (the hyoid bone in the neck), form a joint with another bone.

Joints may be classified functionally based upon how much movement they allow and divided in three classes:

1-A joint that permits no movement
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There are two varieties of joints possible, viz, primary and secondary. Primary cartilaginous joint is usually a temporary form of joint, which is hyaline in character, is, in most cases, converted into bones. Primary cartilaginous joints are found in the epiphyses and diaphyses of the long bone of the femur. Secondary cartilaginous joint are connected together by a flattened disc of fibrocartilage of a more or less complex structure. The bones are connected by bands of white fibrous tissue termed ligaments Examples of amphiarthrosis include the intervertebral disks of the spine and the joint between the manubrium and the body of the sternum and the pubic symphysis of the
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