The __________ is a skull bone that is not interlocked along sutures.
- mandible
- maxilla
- temporal bone
- occipital bone
Introduction:
The skeletal structure supporting the formation of the head and guards the brain is known as skull or cranium. The cranium or skull is further divided into facial bones and cranial bones. A suture is a fibrous joint that is present in the skull.
Answer to Problem 1PL
Correct answer:
The correct answer is option (a) mandible.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a) mandible. The cranial system consists of a total of 22 bones. Among which 8 bones are of cranium and 14 bones are facial bones. The mandible comes under facial bone. It is the lower jaw in humans. Mandible is the largest bone of the facial skeleton and is not joined by any suture. Therefore, this is the correct answer.
Explanation for incorrect answer:
Option (b) Maxilla. Maxilla is a part of the facial skeleton and forms the upper jaw in humans. It is composed of two maxillary bones that are joined by intermaxillary suture, and form anterior nasal spine. Therefore, this is an incorrect answer.
Option (c) Temporal bone. It is a part of the 8 cranium bones that form the sidewalls of the skull. Temporal bone is connected to other bones of the skull by different sutures such as squamosal suture that connects temporal bone with lower border of the parietal bone and occipitomastoid suture that joins the temporal bone with the occipital bone. Therefore, this is an incorrect answer.
Option (d) Occipital bone. It is one of the 8 bones of the cranium that forms its lower back area. It is trapezoidal-shaped. Occipital bone fuses with parietal bone through lambdoid suture. And mastoid portion of the temporal bone and occipital bone is fused through occipitomastoid suture. Therefore, this is an incorrect answer.
Thus, option (a) mandible that forms the lower jaw is a skull bone that is not interlocked along sutures.
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