Accessory gland of mesodermal origin in the male reproductive system of the cockroach are

✅ Explanation: In male cockroaches, the mesadenia are accessory reproductive glands that originate from the mesoderm (middle embryonic layer). They play a crucial role in secreting substances that contribute to the formation of the spermatophore, a capsule that encloses sperm for transfer to the female during mating.

📌 Other Options Explanations:
-Milk gland: Milk glands are specialized structures found in female mammals for producing milk to nourish their young. They are not present in male cockroaches.
-Colleterial gland: These glands are found in the female reproductive system of insects, including cockroaches. They secrete substances that form the ootheca, a protective egg case.
-Vesicula seminalis: While present in the male reproductive system, the vesicula seminalis is primarily responsible for storing sperm and