Operation (game) amongst the players at the beginning of the game. In the U.S and Australian version, players take turns picking "Doctor" cards, which offer a cash payment for removing each particular ailment, using a pair of tweezers connected with wire to the board. Successfully removing the ailment is rewarded according to the dollar amount shown on the card. However, if the tweezers touch the metal edge of the opening during the attempt (thereby closing a circuit), a buzzer sounds, Sam's nose lights up red, and the player loses the turn. The player holding the "Specialist" card for that piece then has
Body cavity tube rolls up and closes ventrally to create a “tube on top of a tube.” The mesoderm, which is another layer of the trilaminar germ disc, holds the tubes together and the lateral plate mesoderm, the middle layer of the germ disc, splits to form a visceral layer associated with the gut and a parietal layer, which along with the overlying ectoderm, forms the lateral body wall. The space between the visceral and parietal layers of lateral plate mesoderm is the primitive body cavity. When the lateral body wall folds, it moves ventrally and fuses at the midline. The body