Describe the reproductive system of Periplaneta and draw a neat and labelled diagram of it. (K & S)
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Ejaculatory Duct:
The ejaculatory duct is an elongated wide median duct which runs backwards in the abdomen and opens out by male gonopore situated ventral to the anus.
(iv) Utricular or Mushroom-shaped Gland:
It is a large accessory reproductive gland, whitish in colour and situated at the junction of vasa deferentia with the ejaculatory duct. It has a mass of glandular tubules of three kinds, the peripheral long tubules or utriculi majores, the central tubules are small short tubules or utriculi breviores and behind the short central tubules are some short but more bulbous tubules forming the seminal vesicles filled with sperms.
(v) Phallic or Conglobate Gland:
It is a long and club-shaped accessory gland. Its anterior broader end lies in the 6th segment slightly to the right of the nerve cord. It narrows posteriorly into a tubular structure and finally tapers to open by a separate aperture located close to the male gonopore at the hind end of the body.

(vi) External Genitalia:
Some chitinous asymmetrical structures are found surrounding the male gonopore at the end of the abdomen. These are three phallomeres or male gonapophyses which constitute the external genitalia.
Right Phallomere:
It is mid-dorsal in position. It has two chitinous but membranous horizontal opposing plates and a broad serrate lobe with a saw- toothed edge and two large teeth, and at its posterior side it has a sickle-shaped hook.
Left Phallomere:
It has a broad base from which several structures arise, on the extreme left is a long slender arm with a curved hook called titillator, next to the titillator is a shorter and broader arm ending in a black hammer-like head called pseudopenis.
Close to the pseudopenis are three small soft lobes, one of which bears a hook and is called an asperate lobe. The duct of the phallic gland traverses the left phallomere and opens between the asperate lobe and pseudopenis.

The ejaculatory duct is an elongated wide median duct which runs backwards in the abdomen and opens out by male gonopore situated ventral to the anus.
(iv) Utricular or Mushroom-shaped Gland:
It is a large accessory reproductive gland, whitish in colour and situated at the junction of vasa deferentia with the ejaculatory duct. It has a mass of glandular tubules of three kinds, the peripheral long tubules or utriculi majores, the central tubules are small short tubules or utriculi breviores and behind the short central tubules are some short but more bulbous tubules forming the seminal vesicles filled with sperms.
(v) Phallic or Conglobate Gland:
It is a long and club-shaped accessory gland. Its anterior broader end lies in the 6th segment slightly to the right of the nerve cord. It narrows posteriorly into a tubular structure and finally tapers to open by a separate aperture located close to the male gonopore at the hind end of the body.

(vi) External Genitalia:
Some chitinous asymmetrical structures are found surrounding the male gonopore at the end of the abdomen. These are three phallomeres or male gonapophyses which constitute the external genitalia.
Right Phallomere:
It is mid-dorsal in position. It has two chitinous but membranous horizontal opposing plates and a broad serrate lobe with a saw- toothed edge and two large teeth, and at its posterior side it has a sickle-shaped hook.
Left Phallomere:
It has a broad base from which several structures arise, on the extreme left is a long slender arm with a curved hook called titillator, next to the titillator is a shorter and broader arm ending in a black hammer-like head called pseudopenis.
Close to the pseudopenis are three small soft lobes, one of which bears a hook and is called an asperate lobe. The duct of the phallic gland traverses the left phallomere and opens between the asperate lobe and pseudopenis.

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a pair of the testes is the main part of the male reproductive system which is responsible for the production of the sperms. then comes the ducts which carry the sperms from the testis of the cockroach. A mushroom gland is also present that is responsible for the secretions of the glands. phallic gland is also present above the mushroom gland which also assist in the secretions. caudal style and pseudopennis is also present.
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