Medically, a hernia is a tear in body tissues, especially muscle, that allows displacement of body organs. There are three particularly important types of hernias in humans:
inguinal hernia: almost exclusively found in males, these are a tear in the musculature and tissues of the lower abdomen, allowing an intestinal loop to protrude through the front abdominal wall, and are of two types:
indirect inguinal hernia, in which the rift is through the testicular canal,
direct inguinal hernia, in which the rift is a direct tear through the abdominal wall
umbilical hernia: a tear in the tissues around the umbilicus, or navel, allowing organs to protrude through the anterior abdominal wall
... company with Michelet and others, formed the "centre," midway between Erdmann and Gabler on the one hand, and the "extreme left" represented by Strauss, Feuerbach and Bruno ...