Final answer:
An accentuated inward curvature of the lumbar vertebrae is known as lordosis, or swayback, which is an excessive anterior curvature of the lumbar region.
Step-by-step explanation:
The accentuated inward curvature of the lumbar vertebrae is known as lordosis, also referred to as swayback. This condition represents an excessive anterior curvature in the lumbar region of the vertebral column.
Lordosis can be associated with factors such as obesity or late pregnancy, which lead to an anterior shift in the body's center of gravity. This shift causes the pelvis to tilt forward, accentuating the lumbar curve.
Unlike lordosis, kyphosis is characterized by an excessive posterior curvature of the thoracic region, and scoliosis is identified by an abnormal lateral bending of the spine.