Question

Which one of the following is a flat bone?
A) Carpel
B) Vertebrae
C) Incus
D) Ribs

Answer 1

It is a flat bone that is attached to the sternum. They form a protective framework which is cagelike.

Complete answer:
The flat bones are flat and thin. They do have a little curve sometimes. Flat bones function as a point of connection for muscles or protection for the internal organs.
Now, let us find the solution from the options-
Carpel is a tunnel that connects the forearm to the hand. The tunnel is bounded by the wrist bones and the connective tissue flexor retinaculum. The carpal bones are the angular bones. Thus, the option A is incorrect.
In an adult human being, the vertebral column consists of 33 vertebrae, of which 24 are classified as articulating vertebrae and are divided by an intervertebral disc. The intervertebral disc removes the remaining 9 vertebrae and creates two sets of fused structures. They are not flat bones. Thus, the option B is incorrect.
A bone in the middle ear is the incus or anvil. The incus is a small bone and is one of the middle ear’s three ossicles. It is not a flat bone. Thus, the option C is incorrect.
Ribs are bones which are flat. There are 12 sets of ribs in humans. Each rib is a thin flat bone attached to the vertebral column dorsally and to the sternum ventrally. A cagelike protective framework is built around the organs of the upper torso. In the back, all 12 of the ribs are attached to the spine.

Thus, the correct answer is option (D) Ribs.

Note: The flat bones are the parietal, occipital, frontal, lacrimal, nasal, hip bone, vomer, ribs, sternum and scapulae. Either comprehensive protection or the supply of large surfaces for muscle attachment is the main feature of flat bones.