Fine structure of cells and tissues of Cysticercus tenuicollis aged 13 and 16 days.

A study has been made on the fine structure of three postembryonic phases of C. tenuicollis. We observed the differentiation of the villus-like microtriches without a distinct point. A lysis of host cells was caused by a secretion released from vesicles and droplets in the microthrix border. We distinguished 5 types of little-specialized cells during the initial phase of bladder development. The smallest of these cells were persisting oncospheral germ cells. The differentiation of cells terminated with the differentiation of the excretory system in a 16 day-old larva.