<prompt> True statement about anatomy of anal canalPuborectalis is essential to maintain continenceInternal sphincter is skeletal muscleInternal sphincter remains in the state of tonic contractionExternal sphincter is supplied by gluteal nerve  <response>: The anal canal is the most terminal pa of the lower GI tractlarge intestine, which lies between the anal verge in the perineum below and the rectum above. The description in this topic is from below upwards, as that is how this region is usually examined in clinical practice. 