The human spine is typically composed of 33 vertebrae. However, in adulthood, the number of vertebrae in the spine is reduced to 24, as the nine vertebrae at the bottom fuse together to form the sacrum (5 vertebrae) and the coccyx (4 vertebrae).
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Certainly! The human spine is a complex structure that provides support, stability, and flexibility to the upper body. It is divided into several regions, each with a different number of vertebrae:
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Cervical spine (neck): The cervical spine consists of 7 vertebrae (C1-C7) and supports the weight of the head while allowing for a wide range of motion.
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Thoracic spine (upper back): The thoracic spine is made up of 12 vertebrae (T1-T12) and connects to the ribs, providing stability to the upper body and protecting the internal organs.
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Lumbar spine (lower back): The lumbar spine consists of 5 vertebrae (L1-L5) and bears the majority of the body’s weight, making it the most prone to injury and degeneration.
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Sacrum: The sacrum is a triangular bone formed by the fusion of 5 sacral vertebrae (S1-S5) and connects the spine to the pelvis.
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Coccyx (tailbone): The coccyx is formed by the fusion of 4 coccygeal vertebrae and provides attachment points for various muscles and ligaments.
Each vertebra in the spine is separated by intervertebral discs, which act as cushions and allow for movement between the vertebrae. The spine also contains the spinal cord, which is a bundle of nerves that transmit signals between the brain and the rest of the body.