Describe labium of cockroach.

• The labium of cockroach, also referred to as lower lip, is said to be formed by the fusion of the second pair of maxillae. 
• Labium has a pair of 3-segmented labial palps on either side which is sensory and help them to choose suitable food.
• The labium, along with labrum help to hold the food between maxillae and mandible while grinding.