APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Sacral Spine-5 fused vertebrae. Coccyx-3-5 fused vertebrae.

Detailed explanation-2: -The coccyx is usually 4 vertebrae although it varies from 2 to 5 vertebrae. Normally the inferior vertebrae are fused together, while the first forms a amphiarthrosis with the fifth sacral vertebra. In elderly people (60 or more years old) it may become fused to the sacrum.

Detailed explanation-3: -The sacrum and hip bones form a ring called the pelvic girdle. Coccyx (tailbone): Four fused vertebrae make up this small piece of bone found at the bottom of the spine. Pelvic floor muscles and ligaments attach to the coccyx.

Detailed explanation-4: -The coccyx is formed of three, four or five rudimentary vertebrae. It articulates superiorly with the sacrum. In each of the first three segments may be traced a rudimentary body and articular and transverse processes; the last piece (sometimes the third) is a mere nodule of bone.

Detailed explanation-5: -The bottom of the spine is called the sacrum. It is made up of several vertebral bodies usually fused together as one. The remaining small bones or ossicles below the sacrum are also fused together and called the tailbone or coccyx.