We just learned about the Costoxiphoid Ligaments that connects the ribs to the xiphoid process.
Another piece of connective tissue is the Posterior Sacroiliac Ligament.
This is a large bunch of tissue that connects the sacrum (tailbone) to the ilium (hip bone), on the posterior (back) part of the body.
(from: wikipedia - posterior sacroiliac ligament)
Kid Facts - Blast from the past: Sacral Plexus