Question

intramembranous ossification occurs in:

• skull bones.
• arm and leg bones.
• secondary bone.
• long bones.

question 48

appositional growth produces:

• bone growth in length.
• intramembranous ossification.
• endochondral ossification.
• bone growth in width.

Explanation:

Analyze intramembranous ossification

Intramembranous ossification is the process of bone development from fibrous membranes. It is involved in the formation of the flat bones of the skull, the mandible, and the clavicles. In contrast, long bones (like arm and leg bones) develop via endochondral ossification, which uses a hyaline cartilage model. Therefore, intramembranous ossification occurs in skull bones.

Analyze apposition growth

Appositional growth refers to the increase in the diameter or thickness of bones. Osteoblasts in the periosteum secrete bone matrix on the external surface, while osteoclasts on the internal surface erode bone, allowing the bone to grow wider without becoming too heavy. In contrast, interstitial growth at the epiphyseal plate produces bone growth in length. Therefore, appositional growth produces bone growth in width.

Answer:

Question 1

• skull bones. (Correct answer)
• arm and leg bones.
• secondary bone.
• long bones.

Question 2

• bone growth in length.
• intramembranous ossification.
• endochondral ossification.
• bone growth in width. (Correct answer)