Which type of bone is formed from a membrane?

Question

BlackTom AI · Accepted Answer

The question asks which type of bone is formed from a membrane, so we evaluate each option based on how bones develop.
Option 1: Pelvic bone. The pelvic bones are primarily formed through endochondral ossification rather than directly from a membrane, so this option is not correct for membrane-derived formation.
Option 2: Arm bone. Most arm bones, such as the humerus, develop through endochondral ossification from a cartilage model, not directly from a membrane, making this choice incorrect for the membrane-derived criterion.
Option 3: Skull bone. Many flat bones of the skull are formed by intramembranous ossification, which starts directly from mesenchymal tissue within a membrane without a cartilage intermediate. This aligns with the membrane-origin concept, so this option is correct in the context of the question.
Option 4: Leg bone. Leg bones like the femur typically arise through endochondral ossification from a cartilage model, not directly from a membrane, so this is incorrect for the membrane-derived formation.
Option 5: Wrist bone. The short bones of the wrist (carpals) largely develop by endochondral ossification, not directly from a membranous template, making this choice incorrect as well.
In summary, only skull bones are classically formed via intramembranous ossification from a membrane, whereas the others largely develop through endochondral processes from cartilage.

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