Question

Which one of the following is not the cranial bone?
a. Frontal
b. Zygomatic
c. Temporal
d. Sphenoid

Answer 1

Hint: Human skull consists of a total of 22 bones, consisting of two sets of bone — mainly cranial (the upper and back of the skull) and facial bone (from the top of the head downwards).

Complete answer:
> Option A is incorrect. The frontal bone is a flat bone that makes up your forehead. It also forms your upper eye sockets.

> Option B is correct. The zygomatic bone (also cheekbone, malar bone) is a paired facial bone located on the upper lateral side of the face, forming the cheek's prominence.

> Option C is incorrect. This is a pair of irregular bones positioned beneath each parietal bone.

> Option D is incorrect. The sphenoid bone is an irregular bone that sits underneath the frontal bone. It covers your skull's width and comprises a significant part of your skull's base.

So, the correct answer is Option B.

Additional information:
- The skull consists of 2 sets of bones namely cranial (8) and facial (14), which are 22 bones in all. The cranial bones contain one ethmoid bone, one frontal bone, one occipital bone, two parietal bones, one sphenoid bone, and two temporal bones.
- The facial skeleton's 14 bones are the vomer, 2 inferior nasal conchae, 2 nasal bones, 2 maxilla, mandible, 2 palatine bones, 2 zygomatic bones, and 2 lacrimal bones. Few reports indicated that a paired bone is one, or that the maxilla has two bones and parts thereof; some sources say the hyoid bone or the three middle ear ossicles but the twenty-two suggested general agreement on the number of bones in the human skull. Several of these bones in the facial skeleton are flat bones, such as occipital, parietal, frontal, neurocranium and nasal, lacrimal, and vomer.

Note: Skull serves as brain defense, fixing the distance between the eyes to allow stereoscopic vision, and fixing the location of the ears to allow the direction and distance of sound to be soundly focused.