a ridge of skin extending from the anus through the perineum. In males it extends further up the scrotum and penis. It represents a fusion line from embryological development and may be the site of cysts and other harmless structures.
A measure of central tendency. The median is found by arranging the values in order and then selecting the one in the middle. If the total number of values is even, then the median is the mean of the two middle numbers. The median is useful where the distribution has extreme values which otherwise skew the data.... median