The spine, also known as the spinal column, consists of vertebrae and intervertebral discs in a special shape, located in the middle of the back, connected to the skull in the upper part of the back, connected to the ribs in the middle part of the back, and forming the pelvis with the hip bones in the lower part of the back. From top to bottom, there are 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacrum (synthesized from 5 sacral vertebrae) and 1 coccyx (synthesized from 4 coccygeal vertebrae)*** 24 (adult) separate vertebrae. The interior of the spine forms a longitudinal spinal canal from top to bottom, containing the spinal cord. The spine is the bone in the middle of the back of humans and vertebrates, the back or spine of a person or animal.

脊梁 jǐ liáng

脊梁 meaning originally refers to the back of the spine. Later, it was used as a metaphor to describe a person or an object as a support.

The meaning of "spine" was originally the back of the spine.