Comment on the functions of alary muscles in cockroach ?

Explanation

1. In cockroach the heart consists of 13 chambers with ostia on either side.
2. The blood from the sinuses enters the heart through the ostia and is pumped anteriorly to sinuses again.
3. The triangular muscles that are responsible for blood circulation in the cockroach are called alary muscles (13 pairs).
4. One pair of these muscles is found in each segment on either side of the heart.