Describe the structure of maxilla of cockroach mouth part
Answers
It functions to cut and manipulate food in the mouth. ... The labium forms the lower portion of the buccal cavity in insects. The prementum has a pair of labial palps laterally, and two broad soft lobes called the paraglossae medially. These paraglossae have two small slender lobes called glossae at their base.
Answer:
Mouth parts of cockroach:
Mouth parts of cockroaches are of chewing and biting type.
These are movable, segmented appendages which help in ingestion of food.
The mouth parts of cockroach consists of following pages labrúm, mandibles, maxillae, labium and hypopharynx.
i. Labrum:
Labrum or upper lip is flap like or shield like movable structure which covers the mouth from the upper side.
It forms the anterior wall of mouth cavity.
Function: It holds the food during feeding.
ii. Mandible:
Mandible or true jaws are two dark, hard chitinous structures with serrated margins which form the teeth and is placed below the labium on either side of the mouth.
Function: These helps in cutting and crushing the food.
iii. Maxillae:
Maxillae or accessory jaws are paired appendages situated on either side of the mouth behind the mandibles.
Each maxilla has many jointed structures and shows maxillary palp.
These are also called first pair of maxillae.
Function: It brings the food to the mandibles for mastication.
iv. Labium:
Labium or lower lip is also known as second maxillae which covers the mouth from the ventral side and is firmly attached to the posterior part of head.
It has labial palp which is three jointed.
Function: These are sensory in function. It is useful in pushing the chewed food in the preoral cavity and also prevents the loss of food falling from mandibles during chewing.
v. Hypopharynx:
Hypopharynx or tongue, is a long, prominent medially placed appendage.
It protrudes from the ventral wall of the head in the preoral cavity.
It is a cylindrical structure called lingule.