There are 7 cervical vertebrae, 12 thoracic vertebrae and 5 lumbar vertebrae.
The human spine is made up of different segments of vertebrae connected together, including the cervical, thoracic, lumbar and sacral and coccygeal vertebrae. There are 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacral vertebrae, and 1 coccygeal vertebrae, which are connected in the middle by ligaments, joints, and intervertebral discs.
The spine is the central axis of the human body and is responsible for weight bearing, shock absorption, protection and movement. Among the cervical vertebrae, the occipital and atlas vertebrae mainly play a role in the rotation of the head and neck. The bony vertebral canal of the spine protects the spinal nerves.
The cervical, thoracic, and lumbar spine play different roles and functions depending on the connection of ligaments, joints, and intervertebral discs.