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Composition of trunk bones and characteristics of vertebrae
Trunk bones include 24 vertebrae, 1 sacrum, 1 coccyx, 1 sternum, 12 pairs of ribs. Participate in the composition of spine, bony thorax and pelvis.

Generally, a vertebra has a vertebral body and a vertebral arch, and there are seven protrusions on the vertebral arch.

The characteristics of each vertebra

Irregular shape of vertebrae

You can tell by grasping the main points.

Microcirculation of cervical body

The transverse process with holes is the most obvious.

Thoracic intercostal articular surface

Subspinous process oblique tip imbricate.

The waist load-bearing body is the largest.

The spinous process is wide and flat after stretching.

Pay attention to the characteristics of each vertebral body: (1) The characteristics of cervical vertebrae: ① The vertebral body is smaller. ② A hole in the transverse process is called transverse process hole. ③ The end of spinous process is bifurcated. ④ The specialized cervical vertebrae are: the first cervical vertebra, which has no vertebral body and spinous process and is annular, also called atlas. The second cervical vertebra, with odontoid process, is also called axis. The seventh cervical vertebra, spinous process, also known as carina. Its spinous process is an important body surface marker for counting vertebrae. (2) Characteristics of thoracic vertebrae: ① The thoracic vertebrae and transverse process have articular surfaces connected with ribs. ② The spinous process extends backward and downward in imbricate shape. (3) Features of lumbar spine: ① The vertebral body is large. ② The spinous process is flat and extends horizontally.