Internal Structures of Cockroach

The internal structure of cockroach has following components:

Diagram of Cockroach Digestive System

• The digestive system of a cockroach is composed of many organs, including the foregut, midgut, and hindgut.
• The foregut contains the mouth, mandible, oesophagus, and the crop.
• Crop is the organ where food is stored and is later digested.
• The midgut breaks down the food into smaller components and is associated with the absorption of nutrients.
• The hindgut processes waste materials and is responsible for the excretion of undigested food.

Diagram of Cockroach Respiratory System

• Cockroaches have a respiratory system, and they breathe through tracheae, which are branching tubes that deliver oxygen directly to cells.
• Air enters the body through spiracles that are located on the thorax and abdomen parts, and it later diffuses to the tracheal system.
• Tracheal tubes are extended throughout the body which helps supply oxygen to the tissues and helps in removing carbon dioxide.

Diagram of Cockroach Reproductive System

• Cockroaches exhibit sexual dimorphism with males typically possessing longer antennae and wings than females.
• Males have reproductive organs called testes, while females have ovaries.
• During mating, the male transfers sperm to the female reproductive organ through a structure called the aedeagus.

Diagram of Cockroach Circulatory System

• Cockroaches have an open circulatory system where the haemolymph or (blood) flows freely in the body cavity.
• A tubular heart pumps haemolymph through the arteries and into tiny spaces called sinuses, where it bathes the organs. Haemolymph returns to the heart through openings called ostia, and thus completing the circulatory cycle.

Diagram of Cockroach Nervous System

• The nervous system of a cockroach consists of a brain, ventral nerve cord, and ganglia located in each segment.
• The brain helps in processing sensory information and coordinates the insect’s movements and behaviours in response to the external stimulus.
• Nerve impulses travel along the ventral nerve cord thereby transmitting signals between the brain and other body parts for coordination.

The diagram of a cockroach typically illustrates its external anatomy, showcasing features like the head, thorax, abdomen, legs, wings, and antennae. Cockroaches belong to the phylum “Arthropoda,” under the Animal Kingdom. Students learn the diagram of a cockroach in class 11 in the chapter ‘Structural Organization of Animals’ in NCERT.

The diagram of the cockroach labelled is given below: