EVERYDAY SCIENCE

Detailed explanation-1: -Irregular Bones They are primarily spongy bone that is covered with a thin layer of compact bone. The vertebrae and some of the bones in the skull are irregular bones.

Detailed explanation-2: -Irregular bones are bones with complex shapes. These bones may have short, flat, notched, or ridged surfaces. Examples of irregular bones are the vertebrae, hip bones, and several skull bones.

Detailed explanation-3: -The pelvic girdle (hip girdle) is formed by a single bone, the hip bone or coxal bone (coxal = “hip”), which serves as the attachment point for each lower limb. Each hip bone, in turn, is firmly joined to the axial skeleton via its attachment to the sacrum of the vertebral column.

Detailed explanation-4: -It is a flattened, irregular-shaped bone that articulates with the pubic symphysis, a cartilaginous joint. Image captured from Human Anatomy Atlas. Did you know? The pelvic girdle is part of the appendicular skeleton, which also includes the shoulder girdle and the upper and lower limbs.