Spinal position: the middle of the back, with the upper end connected to the skull;

The number of newborn children's spines is 32-34, and adult spines are composed of 26 vertebrae (7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacral vertebra (5 at birth) and 1 coccyx vertebra) connected by ligaments, joints and intervertebral discs.

The upper end of the spine supports the skull, the lower part is connected with the hip bone, and the middle part is connected with the ribs, and serves as the back wall of the thorax, abdominal cavity and pelvic cavity. The spine has the functions of supporting trunk, protecting internal organs, protecting spinal cord and exercising.

A longitudinal spinal canal is formed inside the spine from top to bottom, which contains the spinal cord (note: the spine is not equal to the spine or vertebra, but is composed of multiple vertebrae).

Extended data:

The development of the spine is formed by mesodermal osteoblasts around the spinal cord and notochord. In the early stage of embryo, a mass of mesenchymal cells is separated from the ventral medial surface of each somatic segment, which is called osteogenic segment. The osteogenic node gradually moves around the midline notochord.

At the beginning, the segments of the callus surrounded by the notochord correspond to the body segment. With the further development, the tail end of each callus became dense and connected with the head end of the lower callus to form a new segment called vertebral primordium, that is, the later vertebral body.

shortly after the formation of the vertebral body, dense mesenchyme protrude from the back of the vertebral body, forming a nerve arch and surrounding the spinal cord. The costal process is formed on the ventral surface, and the costal process forms a rib in the thoracic vertebra, and meets the transverse process in the cervical and lumbar vertebrae. Vertebral primordium forms cartilage and then ossifies into vertebral body.