Which bones are included in the pelvic girdle?

• A. The two hip/innominate bones
• B. The femur and tibia
• C. The sacrum and coccyx
• D. The ilium and ischium

Answer: (A)

The pelvic girdle is primarily composed of the two hip bones, also known as the innominate bones. These bones are each made up of three fused components: the ilium, ischium, and pubis. They connect the lower limbs to the axial skeleton and play a crucial role in supporting the weight of the upper body when sitting or standing. In addition to providing attachment for muscles, the pelvic girdle encases the pelvic cavity, which contains organs related to digestion, reproduction, and urination.

While the other parts mentioned in the alternatives contribute to the pelvis or lower limb, they do not constitute the pelvic girdle itself. For instance, the femur and tibia are bones of the thigh and lower leg respectively, the sacrum and coccyx are part of the vertebral column at the base of the spine, and the ilium and ischium are specific components of the hip bone. Therefore, focusing on the complete structure of the pelvic girdle, which is formed by the left and right hip bones, confirms why the inclusion of the two hip/innominate bones is the correct answer.