CTOs are usually not considered desirable by collectors, but, with some issues of stamps, postally used examples are very hard to obtain; and some catalogues like Scott's will list values for CTOs and place a premium on postally used copies.
The vertebral body is the main part of the bone in the spinal column. Between these areas of the vertebrae are the intervertebral discs, which support the vertebrae above and cushion the area between the bones. The major portion of the vertebra faces the body, in front of the spinal cord, in humans.he vertebral body is the main part of the bone in the spinal column. Between these areas of the vertebrae are the intervertebral discs, which support the vertebrae above and cushion the area between the bones. The major portion of the vertebra faces the body, in front of the spinal cord, in humans.
The T4 vertebra is the fourth thoracic vertebra that makes up the middle segment of spinal column of the human body. The thoracic spinal vertebrae consist of 12 total vertebrae and are located between the cervical vertebrae (which begin at the base of the skull) and the lumbar spinal vertebrae. The spinal column supports the top of the human body. It extends from the pelvis up the length of the back, connecting to the skull.