Question

Which of the following paired bone is present in the skull
A. Frontal bones
B. Parietal bones
C. Occipital bone
D. Sphenoid bone

Answer 1

Hint: Skull forms a protective cavity for the brain and supports the structure of the face. Skull has composed of many bones joined by sutures which are fibrous joints such as coronal suture, sagittal suture, and lambdoid suture.

Complete answer: Cranium: It forms the brain cavity and protects the brain, meninges, and vasculature of the brain. Further cranium is divided into calvarium which consists of frontal, occipital, and two parietal bones, and cranial base which consists of six bones namely: frontal, sphenoid, ethmoid, occipital, parietal, and temporal bones. These bones show articulation with atlas, facial and jaw bone.
Face or viscerocranium: It protects tissues of the face. It consists of 14 bones :
 1.Zygomatic (2): cheekbones articulate with temporal, sphenoid, frontal and maxillary bones.
2.Lacrimal (2): Present at medial wall of the orbit and is smallest in size
3.Mandible articulate with a base of the cranium with temporomandibular joint and is known as jaw bone
4.Vomer: Posterior part of the nasal septum
5.Maxilla (2): Forms upper jaw and hard palate
6.Palatine (2): Part of the hard palate and rear end of the oral cavity
7.Nasal (2) present at the bridge of the nose
8.Inferior nasal conchae (2): Present in the nasal cavity and increases the surface area of the nasal cavity.
2 parietal bones are present in the cranium. Hence option B-Parietal bones is correct.

Note: Skull is the protective bony cavity-forming head and supports face. The largest bone of the skull is the mandible. 22 bones are present in total which are joined with synarthrodial joints. Eight cranial bones present are the occipital bone, two temporal bones, two parietal bones, sphenoid bone, ethmoid and frontal bones. Fourteen facial bones include two zygomatic, two lacrimal, two palatine, two maxilla, two nasal, two nasal conchae, mandible, and vomer.