Identify the correct path of blood circulation in cockroach.

Pericardial sinus → Ostia → Heart → Aorta → Head sinus.

Blood from the pericardial sinus enters the heart through the ostia. From the heart blood is pumped anteriorly into the head sinus  through the aorta. From the head sinus, it enters the perineural sinus and the perivisceral sinus and from there to the pericardial sinus.