Most Popular. An impact driver looks similar to a drill/driver but for one noticeable distinctionâinstead of a keyless chuck, it has a collet that accepts hex-shanked driver bits. This tool is specially engineered to do one job: drive screws, which it does faster and easier than any other tool. Impact drivers can drive long, large fastenersâincluding fat lag screwsâthat would stall the very best drill/driver.
Sigmoid colon. The sigmoid colon (pelvic colon) is the part of the large intestine that is closest to the rectum and anus. It forms a loop that averages about 35-40 cm in length. The loop is typically shaped like a Greek letter sigma (Ï) or Latin letter S (thus sigma + -oid).
1 The large intestine contains all of the colon, but the colon does not contain the cecum, appendix, rectum, or anal canal.  The colon is only a part (the biggest part) of what makes up the large intestine. The colon has 4 parts - ascending colon, transverse colon, descending colon, and sigmoid colon. The anal canal, rectum, cecum, and appendix are not part of the colon.