The slightly movable articulation between the sacrum and posterior portion of the ilium is called

The correct answer will be - sacroiliac joint

Explanation:

The sacroiliac joint is a type of joint which joins the sacrum bone (support the spine) to the ilium bone (support the sacrum on both sides).

These bones are held together by a collection of strong ligaments which can support the weight of the upper body. The joints contain irregular depressions and elevations which interlock the two bones.

Thus, the sacroiliac joint is the correct answer.

Sacroiliac. slightly movable articulation between the sacrum and posterior portion of the ilium. ischium. forms the lower posterior portion of the pubic bone, bears the weight of the body when sitting.