EVERYDAY SCIENCE

Detailed explanation-1: -The coccyx, commonly known as the tailbone, is below the sacrum. Individually, the sacrum and coccyx are composed of smaller bones that fuse (grow into a solid bone mass) together by age 30. The sacrum is made up of 5 fused vertebrae (S1-S5) and 3 to 5 small bones fuse creating the coccyx.

Detailed explanation-2: -The sacrum is made of five fused vertebrae configured as an inverted triangular bone that is concave anteriorly and convex posteriorly. Within the sacrum lies the sacral canal, which is a continuation of the vertebral canal.

Detailed explanation-3: -Facts about the pelvis It contains the following: Sacrum. A spade-shaped bone that is formed by the fusion of 5 originally separate sacral vertebrae.

Detailed explanation-4: -The triangular sacrum consists of the five fused sacral vertebrae, which are dorsally convex. The sacrum inserts in a wedgelike manner between the two iliac bones, articulating superiorly with the fifth lumbar vertebra and caudad with the coccyx.

Detailed explanation-5: -The sacrum – the base of the spine that is composed of five vertebrae fused (joined together) as one solid unit. The sacrum attaches to ilium of the pelvis, forming the sacroiliac joints. The coccyx – the “tailbone” located below the sacrum, composed of four fused vertebrae.