What term best describes the area between the lowest ribs and the pelvis?

The term that best describes the area between the lowest ribs and the pelvis is "lumbar." The lumbar region is specifically located in the lower back and encompasses the five vertebrae in the lumbar spine, which are situated between the thoracic region (rib area) and the sacral region (pelvic area). This zone is significant in both anatomy and clinical contexts as it houses important structures like the spinal cord, major nerves, and vital muscles that support the torso and facilitate movement.

The lumbar region is commonly referred to in medical terms when discussing back pain, injuries, or surgical procedures, making it relevant in both healthcare and anatomical studies. Other terms, such as "frontal," refer to different structures or planes in the body, "femoral" is related specifically to the thigh region, and "mammary" pertains to the breast area, thus not correctly identifying the space between the ribs and pelvis.