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).
In 54 (41%) patients, the sigmoid colon was within the left lower quadrant. In 63 (48%) patients, one or more loops of the sigmoid colon were within the right lower quadrant. In 11 (8%) patients, the sigmoid colon was vertically oriented. In three (2%) patients, the position of the sigmoid colon was indeterminate.