The spine curves in an elongated "S" shape when viewed from the side, with the upper back bowing outwards and the lower back curving slightly inwards. However, when viewed from the back, the spine should appear straight.
Here's a more detailed breakdown of the spine's natural curves:
- Cervical Curve (Neck): This is an inward curve, known as a lordotic curve. It helps support the weight of the head and allows for flexibility.
- Thoracic Curve (Upper Back): This is an outward curve, called a kyphotic curve. It provides space for the rib cage and protects vital organs.
- Lumbar Curve (Lower Back): Similar to the cervical curve, this is an inward (lordotic) curve. It bears much of the body's weight and facilitates movement.
- Sacral Curve (Pelvic Region): This is an outward (kyphotic) curve that connects the spine to the pelvis.
Therefore, it's the combination of these alternating inward (lordotic) and outward (kyphotic) curves that creates the "S" shape when viewed from the side. A healthy spine maintains these curves within a normal range. Deviations from this normal curvature, such as excessive kyphosis (hunchback) or lordosis (swayback), can lead to pain and other health problems. Also, a sideways curvature of the spine is known as scoliosis, and it will be apparent when viewing the back.
