Describe the male reproductive system of cockroach .

Explanation

The male reproductive system consists of a pair of testes . These are elognated and lobed structures lying one on each lateral side in the fourth to sixth abdominal segments . They are embedded in the fat bodies . From the posterior end of each testis , there starts a thin duct , the vas deferens .
The two vasa deferentia run backwards and inwards to open into a wide median duct , the ductus ejaculatory in the seventh segment .A characteristic mushroom shaped gland is present in the `6^(th)and7^(th)` abdominal segments which functions as an accessory reproductive gland . The gland consists of two types of tubules :
(i) Long slender tubules , the utricull majores or peripheral tubles.
(ii) Short tubules , the utriculi breviores secretion of utriculi majores forms the inner layer of the spermatophore while that utriculli breviores nourishes the sperms . These tubules open in to the anterior part of the ejaculatory duct .