what is ostia in cockroach's circulatiory system?

The heart of cockroach consists of thirteen contractile chambers. A pair of apertures called ostia are present at the posterior end of each chamber laterally. Ostia are guarded by auricular valves to check the flow of blood from the heart to the pericardial sinus (blood filled space). The heart receives blood from the pericardial sinus through ostia. 

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