The dorsal canal consists of three parts. These are-
(i) Dorsal aorta: The first chamber of the heart narrows to form a cylindrical part. This is called the dorsal aorta. It extends from the forehead to the head. It does not contain ostia.
(ii) Heart or heart: The heart of the grasshopper is located in the pericardial sinus. It is composed of several funnel-shaped chambers. The first 3 chambers are located in the thorax and the last 10 chambers are located in the abdomen. In the region between the two chambers, the cardiac wall folds from both sides and enters the cardiac cavity. Each fold has a hole. It is called Ostia. Each chamber is connected to the pericardial sinus by ostia. A pore between two adjacent cells is called an intercellular pore.
(iii) Alary muscle: The triangular muscle that is attached to the heart is called Alary muscle. These muscles arise from the digital floor of the targum. Its broad end is attached to the heart. Alary muscles (6 pairs in total) contract and expand the heart.