Spine and ribs of teleost: the spine has been completely ossified, forming a solid pillar of the body, but the degree of differentiation is very low, only into trunk vertebrae and coccygeal vertebrae. The front and back sides of each vertebral body are concave inward, which is called biconcave vertebral body. Frogs, the spine and ribs of amphibians. In addition to the general increase in the firmness of the spine, the vertebral bodies in the initial subarea of the spine are mostly anterior or posterior, with enhanced support and flexible intervertebral joints. The spine of amphibians is divided into four regions: neck, trunk, sacrum and tail, which is more differentiated from cervical vertebrae and sacrum than fish.

Frog's skeleton is divided into two parts: 1, and the axial skeleton includes skull and spine. 2, appendage bones. Frog skull, skull ossification degree is low, some cartilage is reserved, and the number of bone pieces is small. Because the bones of fish are buried in muscles, they are less affected by the external environment, so the morphological characteristics and traits are not easy to change.