Ischial spine-the ischial spine is the only answer choice on the lateral pelvic wall. it arises just superior to the lesser sciatic notch and serves as the site of attachment of the sacrospinous ligament. the coccyx is the most inferior part of the vertebral column, resulting from the fusion of the four coccygeal vertebrae. it articulates with the sacrum, which means that it is associated with the posterior wall of the pelvis. the ischial tuberosity protrudes posteroinferiorly, not laterally, from the body of the ischium. this is where weight rests when the body is in the sitting postion. the ischial tuberosity also serves as the site of attachment for the sacrotuberous ligament. the obturator canal is the space in the obturator foramen that is not covered with obturator membrane. it transmits the obturator nerve and vessels, and it is on the anterior, not lateral, side of the pelvis. finally, the pectineal line is the ridge on the pubis that creates the anterior border of the pelvic inlet and is an important landmark of the inguinal region.
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