Question

The lower jaw of a man is made up of:
A) 1 bone
B) 2 bones
C) No bones, only muscles
D) 3 bones

Answer 1

Hint:
The lower jaw bone is also called the mandible. This is the only bone that can move from all the bones present in the skull. It is also joined to muscles that perform a function in chewing and in other movements of the mouth. It also helps to hold the bottom teeth in their place.

Complete step by step answer:
Cranial bones are 8 in number. They form a hard protective outer covering i.e., the cranium present inside the brain. The front part of the skull is made up of 14 bones which make up the facial region. At the base of the buccal cavity, a Hyoid is present which is a bone which is shaped like U and it is also included in the skull. Previously there were two separate bones in the lower jaw that are also called the mandible but originally the two bones fuse at the midline and form one. At the downward portion and middle of the body, the chin is projected.
The lower jaw is made up of a mandible that is a single bone. The mandible is a facial bone. The mandible is moveable and is the strongest and largest facial bone. It forms the lower jaw. It helps in chewing, speech, and giving facial expressions. The mandible is present on the inferior side to the maxilla. Also, the mandible has a body and the ramus.

Option ‘A’ is correct

Note:
The mandible has the ability to grow more forward than the maxilla (the upper jaw). This mostly stops when the growth of a child stops. But some males face this complication as they can grow up to 25 years of age