Sugar is Bittersweet for Some Roaches (image) North Carolina State University Caption This is the head of a male German cockroach, showing the four major external chemosensory-paired appendages. The antennae extend upward (black compound eyes behind them), the longer maxillary palps and shorter labial palps extend downward, and the paired paraglossae are on either side of the mouth. Each appendage contains many sensory hairs, some of which function in gustation. A tastant is delivered to the mouth in a dyed (blue) drop of water. Credit Ayako Wada-Katsumata and Andrew Ernst Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.