Coccyx vs. Sacrum

Coccyxnoun

The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.

Coccyxnoun

The end of the vertebral column beyond the sacrum in man and tailless monkeys. It is composed of several vertebræ more or less consolidated.

Coccyxnoun

the end of the vertebral column in humans and tailless apes

Coccyxnoun

a small triangular bone at the base of the spinal column in humans and some apes, formed of fused vestigial vertebrae.

Coccyx

The coccyx (plural: coccyges or coccyxes), commonly referred to as the tailbone, is the final segment of the vertebral column in all apes, and analogous structures in certain other mammals such as horses. In tailless primates (e.g.

Sacrumnoun

(anatomy) A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.

Sacrumnoun

That part of the vertebral column which is directly connected with, or forms a part of, the pelvis.

Sacrumnoun

wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx

Sacrumnoun

a triangular bone in the lower back formed from fused vertebrae and situated between the two hip bones of the pelvis.

Sacrum

The sacrum (plural: sacra or sacrums), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30.The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It forms joints with four other bones.