os longum

bone, os - rigid connective tissue that makes up the skeleton of vertebrates

endosteum - vascular membrane that lines the inner surface of long bones

epiphysis - the end of a long bone; initially separated from the main bone by a layer of cartilage that eventually ossifies so the parts become fused

diaphysis, shaft - the main (mid) section of a long bone

metaphysis - the growing part of a long bone between the diaphysis and the epiphysis

arm bone - a bone in the arm

leg bone - a bone of the leg