Question

Number of bones in human axial skeleton is
A. 80
B. 100
C. 106
D. 126

Answer 1

Hint: The skeletal system plays a major role in working as an internal support structure to our body. It provides protection for internal organs, allows facilitation of movement, helps in formation of blood cells, as well as it stores minerals. The skeletal system in our body is also known as the musculoskeletal system and it is composed of bones and connective tissue including cartilages, ligaments, tendons and other bone tissues.

Complete answer:
An adult human skeletal system is composed of 206 bones. The axial skeleton is a part of the skeletal system that is distributed along the main axis of the body. It consists of 80 bones which includes the bones of the skull, ossicles of the middle ear, hyoid bone of the throat, vertebral column, and thoracic cage (rib cage).
-Bones of the skull: There are about 22 bones on the part of the head called the skull region which are classified into two major categories: cranial bones and facial bones. Therefore, the skull region consists of 8 cranial bones and 14 facial bones.
-Ossicles of the middle ear: The auditory ossicles of the middle ear which transmits sounds from the air as vibrations are composed of 6 bones.
-Hyoid bone of the throat: There is a single bone that acts as a movable base for the tongue called Hyoid Bone. It is a horseshoe shaped bone which connects the muscles of the jaw, larynx and tongue.
-Vertebral column: In the vertebral column, there are 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacrum and 1 coccyx which comprises 26 bones in total.
-Thoracic cage: There are 25 bones in the thorax region which consists of 24 ribs and 1 sternum.

Hence, the correct answer is option (A).

Note: The primary role of axial skeleton is to provide support and protection for the brain, spinal cord and many of the internal organs. It also provides a surface or a support for the attachment of other bones and muscles in the body by protecting the internal organs to perform its function such as the process of digestion, excretion and so on. It also helps in the protection of the nerves and blood vessels from the brain and spinal cord.