BIO 11.1: Parts of Cockroach

Digestive System

• immediate visible organ

Esophagus
Salivary Gland
Crop
Gizzard
Gastric Caeca

DIGESTIVE SYSTEM:

Foregut: (E S C G G)

Mesenteron

DIGESTIVE SYSTEM:

Midgut: (M)

Ileum
Colon
Rectum
Anus

DIGESTIVE SYSTEM:

Hindgut: (I C R A)

Malpighian Tubules

Excreroty System: (M)

Pericardial hemocoel
Heart
Alary Muscle
Ostia

Circulatory System: (P H A O)

Cerebral ganglion
Nerve cords
Thoracic Ganglia
Thoracic Nerves
Abdominal Ganglia
Abdominal Nerves

Nervous System: (C N T T A A)

Nervous System

• ventral part; composed of a series of fused, segmentally organized ganglia connected by paired longitudinal connectives on the ventral side.

Circulatory System

• dorsal part; open circulatory system; blood flows through cavities instead of closed blood vessels

Esophagus

• connects the mouth to the crop; transports food down the digestive tract

Salivary Gland

• produces saliva, begins the enzymatic digestion of food in the mouth

Crop

• storage organ for food prior further digestion

Gizzard

• grinds food with its chitinous teeth

Gastric Caeca

• finger-like projections that produce

  digestive enzymes and aid in nutrient absorption.

Mesenteron

• primary site of digestion and absorption

Ileum

• water and salts begin to be reabsorbed from the

  waste.

Colon

• further reabsorbs water and packs undigested food.

Rectum

• waste storage before excretion.

Anus

• exit point for waste materials from the digestive tract

Malpighian Tubules

• tubular structures (fringed by glandular and ciliated cells) that filter nitrogenous wastes and other solutes from the hemolymph.

• They lead into the hindgut, where wastes are combined with digestive waste for excretion.

Pericardial hemocoel

• cavity that contains fluid/blood/haemolymph

Heart

• tubular, segmented structure with multiple chambers (13) that pumps hemolymph from the posterior to the anterior of the body.

Alary muscles

• attached to the heart that help regulate hemolymph flow.

Ostia

• opening in front of dilations; guarded by valves to prevent backflow of blood into heart

Cerebral Ganglion

• Primary brain located in the head.

Nerve cords

• occurs in pair, run along the length of the

  body

Thoracic Ganglia

• located in the thorax; control movement of the legs and wings, as well as some reflexes.

Thoracic Nerves

• branches from the thoracic ganglia

Abdominal Ganglia

• located along the abdomen and control the abdominal muscles, supporting locomotion and digestion.

Abdominal Nerves

• branches from the abdominal ganglia.

Immobilize
wings
legs
ventral side
median line
side
anus
ventral
dorsal
Yeager’s solution

Steps in Dissecting a Cockroach:

• 1. _ Cockroach

• 2. Remove _ and _

• 3. Position cockroach _

• 4. Pin right of _ (not to damage the organs)

• 5. Slit open _ of cockroach and _ side.

• 6. Separate _ from _ region.

• 7. Add _ onto the exposed internal parts (prevent it from drying)