Which of the following structures is NOT part of the pelvic girdle?

The scapula is not part of the pelvic girdle because it is actually part of the shoulder girdle that connects the upper limbs to the trunk. The pelvic girdle is specifically made up of structures that support the weight of the body when sitting and standing and connect the lower limbs to the axial skeleton. The pelvic girdle includes the ilium, sacrum, and coccyx.

The ilium is one of the three bones that make up each half of the pelvis, while the sacrum is a large, triangular bone at the base of the spine that connects the spine to the hip bones. The coccyx, or tailbone, is the small bone at the very end of the vertebral column which also forms part of the pelvis. Therefore, the scapula stands out as the only option that does not belong in this context.