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The skeletal system includes all of the bones and joints in the body.Each bone is a complex living organ that is made up of many cells, protein fibers, and minerals.
The bones of the inferior and anterior portion of the skull are known as facial bones and support the eyes, nose, and mouth.The hyoid is a small, U-shaped bone found just inferior to the mandible.The hyoid is the only bone in the body that does not form a joint with any other bone—it is a floating bone.These 21 fused bones are separate in children to allow the skull and brain to grow, but fuse to give added strength and protection as an adult.The mandible remains as a movable jaw bone and forms the only movable joint in the skull with the temporal bone.The radius and ulna are the two bones of the forearm.
The ulna is on the medial side of the forearm and forms a hinge joint with the humerus at the elbow.
The sternum, or breastbone, is a thin, knife-shaped bone located along the midline of the anterior side of the thoracic region of the skeleton.
The sternum connects to the ribs by thin bands of cartilage called the costal cartilage.
The femur forms the ball and socket hip joint with the hip bone and forms the knee joint with the tibia and patella.
Commonly called the kneecap, the patella is special because it is one of the few bones that are not present at birth.
The skeleton acts as a scaffold by providing support and protection for the soft tissues that make up the rest of the body.