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Multiple Choice
A cranium has ______ temporal bone(s) and ______ ethmoid bone(s).
A
1 temporal bone and 1 ethmoid bone
B
2 temporal bones and 2 ethmoid bones
C
1 temporal bone and 2 ethmoid bones
D
2 temporal bones and 1 ethmoid bone
Verified step by step guidance
1
Step 1: Understand the anatomy of the cranium. The cranium is the part of the skull that encloses the brain and is composed of several bones, including paired and unpaired bones.
Step 2: Identify the temporal bones. The temporal bones are paired bones, meaning there are two of them—one on each side of the skull. They are located near the temples and house structures like the ear canal and inner ear.
Step 3: Identify the ethmoid bone. The ethmoid bone is a single, unpaired bone located in the midline of the skull. It contributes to the nasal cavity and the medial wall of the orbit (eye socket).
Step 4: Recall the classification of bones in the cranium. Paired bones, like the temporal bones, occur on both sides of the skull, while unpaired bones, like the ethmoid bone, are singular and located centrally.
Step 5: Combine the information. The cranium has 2 temporal bones (paired) and 1 ethmoid bone (unpaired). This matches the correct answer provided in the problem.