What is the purpose of skull sutures?

• A. They allow growth of cranial bones during development and later fuse to create a rigid skull.
• B. They enable skull bones to move freely in adulthood.
• C. They are spaces for brain growth only.
• D. They have no function.

Answer: (A)

Skull sutures are fibrous joints between the cranial bones that act as growth sites. Their main job is to allow the skull to expand as the brain grows during development. In infants and children, these joints stay flexible, letting the bones slide apart just enough to accommodate increasing brain size and to help the skull mold during birth. Over time, the sutures gradually ossify and fuse, forming a solid, rigid skull that protects the brain. They aren’t spaces designed for brain growth themselves, nor do they function to keep the skull bones movable in adulthood. Their essential role is enabling growth early on and then contributing to a strong, protective skull once fusion occurs.