Describe the female reproductive system of cockroach .

Explanation

The female reproductive system of periplaneta consists of a pair of ovaries a pair of oviducts vagina , spermathecal papilla and colleterial glands , overies .
A pair of large overies lies laterally in 2 to 6 abdominal segments . They are light yellow in colour surrounded by fat bodies . Each ovary consists of eight tubules called ovarian tubules or ovarioles . Each ovariole consists of a tapering anterior filament called germarium and a posterior wider vitellarium . The germrium contains various stages of developing ova and the vitellarium contains mature ova with yolk. The tapering ends of the ovarioles of each ovary unite to form a single thread which , attaches to the dorsal body wall . The ovarioles , at their posterior end unite to form a short wide oviduct . The oviduct . The oviducts unite to form a very short median vagina The vertical opening of the vegina is called female genital pore . It opens into a large genital pouch on the eighth sternum . A spermatheca or receptaculum seminis, consisting of a left -sac like and a right filamentous caecum , is present in the `6^(th)` segment which opens by a median aperture on a small spermathecal papilla in the dorsal wall of the genital pouch on the ninth sternum . In a fertile female , the spermatheca contains spermatophores , obtained during copulation. A pair of branched colleterial glands is present behind the ovaries .These glands open in to the genital pouch separately , just above the spermathecal aperture . Secretion of two collaterial glands forms a hard egg case called oothaca around the eggs .