It is filled with fluid, in which the main body of the larva, called scolex (which will eventually form the head of the tapeworm), resides.
When humans eat raw or undercooked pork or beef that is contaminated with cysticerci, the larvae grow into adult worms inside the intestine.
Under certain circumstances, specifically for the pork tapeworm, the eggs can be accidentally eaten by humans through contaminated foodstuffs.
Hence, it was given a proper scientific name Taenia cellulosae in 1800 by German naturalist Johann Friedrich Gmelin.
[1][7] In the normal life cycle of Taenia, cysticerci develop in the muscles of the intermediate hosts such as pigs, cattle, and sheep.
Due to accidental consumption of the eggs from contaminated foodstuffs, cysticerci in humans produce clinical symptoms, cysticercosis.