Final answer:
The part of the spine between the rib cage and the pelvis is known as the Lumbar spine. It has the greatest range of motion for rotation compared to other regions of the spine.
Step-by-step explanation:
The part of the spine between the rib cage and the pelvis is called the Lumbar spine. The lumbar spine consists of five vertebrae (L1-L5) and is located in the lower back.
It is the largest and strongest section of the vertebral column, responsible for supporting the weight of the upper body and allowing for movement and flexibility. The lumbar spine has the greatest range of motion for rotation compared to the other regions of the spine, making it crucial for various daily activities such as twisting, bending, and turning.
For example, when you twist your torso to look over your shoulder, the lumbar spine allows for this rotational movement.