Appe Dix . Get the latest and most reliable health information at healthprep. Appendix, formally vermiform appendix, in anatomy, a vestigial hollow tube that is closed at one end and is attached at the other end to the cecum, a pouchlike beginning of the large intestine into which the small intestine empties its contents. Dixie's Birthday Party Phoenix, Scottsdale, Charleston, Nantucket, Italy, Wedding Photographer from www.melissajill.com Its exact function is unclear. When writing an appendix, there are specific writing styles one is required to follow. Appendix, formally vermiform appendix, in anatomy, a vestigial hollow tube that is closed at one end and is attached at the other end to the cecum, a pouchlike beginning of the large intestine into which the small intestine empties its contents.