27. Answer in detail II

 

a. The skeleton that consists of the bones present along the axis or central line axis or peripheral line  of the human body is known as the axial skeleton.

 

b. The skull is a hard structure made up of many bones known as the cranial bones and facial bones. It is also known as the cranium or brain box. It  is formed by 1122 bones, out of which 8 bones are fixed together to form the facecranium, and the other 1614  bones fuse to form the facial bone.

 

c. The vertebral column is found in the trunk region to offer support to the upper part of the body. Out of the 33 vertebrae 79 are known as cervical vertebrae, 12 as lumbar vertebraesacral vertebrae,  57 fused sacral and 35 fused coccygeal vertebrae.

 

d. Ribcage is a cone-shaped structurearc shaped structure that occupies the chest region. It is made up of 1812 pairs of ribs that are attached to vertebrae at the back, curve around to form a cage.