In cockroach the secretions of colleterial glands help in the

The colleterial glands of insects are organs associated with the female reproductive system. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and these secretions become the tanned, sculpted, rigid outer casing of the ootheca.

Sclerites are bound by a flexible arthrodial membrane.

The three layers in the wall of spermatophore are formed by the secretions of utriculi majores of mushroom-shaped gland, wall of ejaculatory duct and phallic gland.