The first place seems to be the clavicle, at an age of 7 to 12 months. There is ossification in the ciliary muscles about the same time. Often only long bones or bones of a visible size seem to be considered. But ossification can occur anywhere there is bone, muscle or mammalian tissue with any kind of stress and a supply of calcium.
Endochondral ossification is one of the two essential processes during fetal development of the mammalian skeletal system by which bone tissue is created. Unlike intramembranous ossification, which is the other process by which bone tissue is created, cartilage is present during endochondral ossification.
