ORGANS IN A MATURE PROGLOTTID
In a mature proglottid , both male and female reproductive organs are well developed. Tapeworm exhibits protandry ( the male reproductive organs mature earlier than the female reproductive organs ).
The male reproductive organs are testes , vasa efferentia, vas deferens and cirrus.
1.Large number of testes scattered in the parenchyma.
2.Vasa efferentia from these testes open into a common vas deferens.
3. The vas deferens opens into the genital atrium.
4. Vas deferens ends as a muscular copulatory structure called cirrus.
The female reproductive organs are ovary, ootype , vitelline gland mehli’s glands ,uterus and vagina.
1.In each proglottid , a bilobed ovary is present.
2. The two lobes are connected by isthmus.
3.The common oviduct from the isthmus opens into a chamber called ootype.
4.The vitelline gland that produces the yolk cells also opens into ootype through the vitelline duct.
5.The oviduct is connected to the genital atrium through a passage called vagina.
6.A blind sac like structure called uterus opens into the ootype.It stores the fertilized eggs.
7.Several unicellular glands called mehli’s glands present around the ootype.The secretions of these glands lubricate the passage of capsules into uterus.
In each proglttid, excretory canals and nerve cords are also present laterally on either side.Opening into each excretory canal several attached flame cells are present. The flame cells are primarily osmoregulatory in function. They are also useful in excretion.