The scapula, also known as the shoulder blade, is a flat triangular bone located in the upper back. It is connected to the clavicle, or collarbone, and the humerus, or upper arm bone. One of the structures that can be found on the scapula is the acromion, which is a flat, expanded process present on the spine of the scapula. The spine of the scapula is a slightly elevated ridge which is present on the dorsal, flat and triangular body of the scapula. The tibia, on the other hand, is a long bone located in the lower leg, while the patella is a sesamoid bone located in the knee joint. The ischium is a bone located in the pelvis.