Question 34

The skull is made by the fusion of bones that were separate during childhood.

The adult skull consists of several bones that are initially separate in infancy and childhood, which ultimately fuse together as a person matures. This process is vital for the proper formation and protection of the brain.

A) Hip

The hip is formed from the fusion of three bones: the ilium, ischium, and pubis. However, these bones are not separate during childhood; they form together as part of the pelvic girdle. Thus, this option is incorrect.

B) Ankle

The ankle is made up of multiple bones, including the tibia, fibula, and several tarsal bones. These bones do not undergo fusion from separate components during childhood; instead, they develop together. Hence, this option does not fit the criteria.

C) Arm

The arm consists of the humerus, radius, and ulna, which are distinct bones from early development and do not fuse together over time. Each bone maintains its individual structure throughout life. Therefore, this option is also incorrect.

D) Skull

The skull is comprised of several bones, including the frontal, parietal, and occipital bones, which are initially separate in infancy. These bones gradually fuse together as a child grows, forming a solid structure that protects the brain. This is the correct answer.

Conclusion

The skull is the only structure among the choices that is formed by the fusion of previously separate bones during childhood. The other options—hip, ankle, and arm—do not involve such a fusion process, making them incorrect in this context. Therefore, the skull stands out as the definitive example of this phenomenon.