Patient Education
Spinal Anatomy
Understanding the structure of your spine is the first step toward understanding your condition and treatment options.
The Architecture of the Spine
The human spine is a remarkable structure that serves multiple essential functions simultaneously. It provides the structural support that allows us to stand upright, protects the delicate spinal cord and nerve roots, enables a wide range of movement, and absorbs the mechanical forces generated by daily activities.
Composed of 33 vertebrae organized into distinct regions, the spine works as an integrated system where bones, discs, joints, ligaments, and muscles all contribute to its function. When any component is damaged or degenerates, it can affect the entire system and lead to pain, weakness, or neurological symptoms.
Regions of the Spine
Cervical Spine (C1–C7)
The uppermost seven vertebrae forming the neck region. The cervical spine supports the weight of the head (approximately 10–12 pounds), enables a wide range of head and neck movement, and protects the spinal cord as it exits the brainstem. The top two vertebrae — the atlas (C1) and axis (C2) — form a specialized joint that allows rotational movement of the head.
Thoracic Spine (T1–T12)
The twelve mid-back vertebrae that articulate with the ribs to form the thoracic cage. This section provides structural stability and protects vital organs including the heart and lungs. The thoracic spine has limited mobility compared to other regions due to its connection to the rib cage.
Lumbar Spine (L1–L5)
The five large vertebrae of the lower back that bear the majority of the body's weight. The lumbar spine allows significant flexion and extension movements and is the most common site of back pain and degenerative conditions due to the mechanical stresses it endures daily.
Sacrum & Coccyx
The sacrum consists of five fused vertebrae (S1–S5) that connect the spine to the pelvis. Below it, the coccyx (tailbone) is formed by four small fused vertebrae. Together, these structures provide a stable foundation for the spinal column and serve as attachment points for pelvic muscles and ligaments.
Normal Spinal Curvature
When viewed from the side, a healthy spine has natural S-shaped curves that distribute mechanical stress evenly and maintain balance. The cervical and lumbar regions curve gently inward (lordosis), while the thoracic region curves outward (kyphosis). These curves work together to position the head directly over the pelvis, minimizing the muscular effort required to maintain upright posture.
When viewed from behind, the spine should appear straight. A lateral curvature visible from this perspective is called scoliosis. Excessive curvature in any direction — whether too much lordosis, kyphosis, or scoliosis — can lead to pain, imbalance, and progressive deformity if left untreated.
Key Components of the Spine
Vertebral Body
The cylindrical, weight-bearing portion of each vertebra that stacks to form the spinal column.
Intervertebral Discs
Tough, gel-filled cushions between vertebrae that absorb shock and allow spinal flexibility.
Spinal Canal
The protective tunnel formed by the vertebrae that houses and shields the spinal cord.
Nerve Roots
Bundles of nerve fibers that branch off the spinal cord at each level to supply sensation and movement to the body.
Facet Joints
Paired joints at the back of each vertebra that guide and limit spinal movement while providing stability.
Lamina & Pedicles
Bony arches that connect the vertebral body to the spinous process, forming the walls of the spinal canal.
Spinous & Transverse Processes
Bony projections that serve as attachment points for muscles and ligaments that stabilize the spine.
Ligaments
Strong bands of connective tissue that hold vertebrae together and limit excessive movement.
The Spinal Cord & Nervous System
The spinal cord extends from the base of the brain (brainstem) down to approximately the first lumbar vertebra (L1). It serves as the primary communication highway between the brain and the rest of the body, carrying motor signals downward and sensory information upward.
Below L1, the spinal canal contains a bundle of individual nerve roots called the cauda equina (Latin for "horse's tail"). These nerve roots continue downward to exit at their respective levels, providing sensation and motor control to the lower body and legs.
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Schedule a consultation with Dr. Burton to discuss your condition and explore your treatment options.