Explanation

In the legs of cockroach, tarsus consists of five small, movable joints, the tarsal podomeres. They bears fine hairs. The first four tarsomeres bears soft, adhesive pads called plantulae on the underside near the ends. In ends in a pair of sharp, curved claws. Between the claws, arolium is a delicate hair-covered pad. Only the tarsus of the legs rest on the ground during walking and running. The claws and pads serves back-slipping of the tarsi during movements The pad sticks to the hard, smooth surface and the claws grip the soft and smooth surfaces