Questions: Hydrocephalus causes the bones surrounding the brain to spread farther apart because the excess cerebrospinal fluid builds-up in the cranium. Which of the following bones would most likely be unaffected by hydrocephalus? a. lacrimal bone b. occopical bone c temporalibone d. parnetal bone

The answer is the first one (a): lacrimal bone.

Explanation for each option:

a. Lacrimal bone: The lacrimal bone is a small bone located in the medial wall of the orbit (eye socket). It is not part of the cranium that surrounds the brain, so it would most likely be unaffected by hydrocephalus.

b. Occipital bone: The occipital bone forms the back and base of the skull. It is part of the cranium and would be affected by the increased pressure from hydrocephalus.

c. Temporal bone: The temporal bones are located at the sides and base of the skull. They are part of the cranium and would be affected by the increased pressure from hydrocephalus.

d. Parietal bone: The parietal bones form the sides and roof of the cranium. They would also be affected by the increased pressure from hydrocephalus.

Summary: Hydrocephalus causes the bones surrounding the brain to spread farther apart due to the buildup of cerebrospinal fluid. Among the options provided, the lacrimal bone is the one most likely to be unaffected by hydrocephalus because it is not part of the cranium.