The bony structure at the base of the spine that supports the lower limbs.

The bony structure at the base of the spine that supports the lower limbs.

• A. Pelvis
• B. Rib Cage
• C. Sternum
• D. Tarsals

Answer: (A)

At the base of the spine, weight is transferred through the sacrum into the pelvis, which forms the pelvic girdle that supports and anchors the lower limbs. The pelvis consists of two hip bones (each made of ilium, ischium, and pubis) that join at the pubic symphysis and connect to the sacrum at the sacroiliac joints. This arrangement distributes body weight to the legs during standing and movement and provides attachment points for muscles that move the trunk and legs. The rib cage and sternum are part of the thoracic cage in the upper body, not the base of the spine or a support for the lower limbs. The tarsals are in the ankle/foot, far from the base of the spine. So the pelvis is the bony structure that supports the lower limbs.

At the base of the spine, weight is transferred through the sacrum into the pelvis, which forms the pelvic girdle that supports and anchors the lower limbs. The pelvis consists of two hip bones (each made of ilium, ischium, and pubis) that join at the pubic symphysis and connect to the sacrum at the sacroiliac joints. This arrangement distributes body weight to the legs during standing and movement and provides attachment points for muscles that move the trunk and legs. The rib cage and sternum are part of the thoracic cage in the upper body, not the base of the spine or a support for the lower limbs. The tarsals are in the ankle/foot, far from the base of the spine. So the pelvis is the bony structure that supports the lower limbs.