What is the anatomy of the spine divided into?

The anatomy of the spine is accurately divided into five distinct regions: cervical, thoracic, lumbar, sacral, and coccygeal. Each region has specific characteristics and functions, contributing to the overall structure and biomechanics of the vertebral column.

The cervical region, consisting of the first seven vertebrae (C1-C7), supports the head and allows for a wide range of motion. The thoracic region, comprising twelve vertebrae (T1-T12), articulates with the ribs and helps protect vital organs in the thoracic cavity. The lumbar region includes five vertebrae (L1-L5) known for their robustness as they bear the most weight and provide stability while allowing for flexibility in movement. The sacral region consists of five fused vertebrae (S1-S5) that form a solid base of support for the spine and pelvis. Finally, the coccygeal region includes the coccyx, or tailbone, which consists of three to five fused vertebrae, providing attachment for ligaments and muscles.

In contrast, the other options mix regions relevant to the spine with unrelated anatomical features, leading to a less accurate grouping of the spine's anatomy. Understanding these divisions is critical for studying spinal