Joints

 A joint is a physical connection between two bones.

Joints contain a variety of fibrous connecting tissue:

-Ligaments: they connect the bones to each other.

-Tendons: tendons connect a muscle to a bone.

-Cartilage: It covers the ends of bones and provides cushioning.

The knee joint is the point of conection between the femur and the tibia.

The most common joints in our body are freely movable and they are called synovial joints. Synovial joints are surrounded by fibrous tissue or sac called the joint capsule. The lining of this capsule secretes synovial fluid, which lubricate the tissues and spaces within this capsule. There are several times ofsynovial joints that allow diferent forms of motion: ball and socket joints, condyloid joints, gliding joints, pivot joints...

The majority's of human body joints are allow for movement. Joints that do allow for motion, such as knee or ankle, have a predetermined range of movement, which is basically how far is each direction that joint can move or bend comfortably.

Typically, a joint range of movement is limited to 180 degrees or less.

-Extension: is an action in which the bones forming the joint are moving farther apart to each other.

-Flexion: occurs when the bones that form a joint are pulled closer together.

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