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The human skeletal system contains around 300 bones at birth and 206 bones in an adult. The main bones include the skull, jawbone, collarbone, shoulder blades, ribs, backbone, hip bones, finger bones, thigh bones, knee caps, leg bones, and foot bones. Bones are made up of compact bone, spongy bone, and cartilage. Calcium and minerals give bones their hardness, with the jawbone being the hardest. Joints are where two or more bones connect, and the main types of joints are ball-and-socket, hinge, pivot, and gliding joints. The spinal column surrounds and protects the spinal cord.




































