the shape of distinct shoulders, a small protuberance at abopercular end,an asymmetrical miracidium inside the egg. One of the smallest helminth ova yellow-brown, thicker eggshell Material examined: feces and drawn liquid from duodenum Examining method: see examination of alimentary helminths (2)See the scanning electron-microscopic(SEM) photograph of ovum(Demonstration) 4. Pathology (1)See specimen, note the parasites in billiary passages(Demonstration) (2)See adult worms inhabiting in billiary passages of a reservoir host(Demonstration) Exercise I. Draw egg of C. sinensis in detail 2. Label in full an adult worm of C. sinensis 3. Draw a life cycle draft of C. sinensis, including final host, intermediate host; adult parasitized site, main injured organs; excretory route of ovum, pathogenic diagnostic methods the first and se intermediate hosts and in which how the larva development; the infective infection mode and infection route Thinking 1. Why one can obtain parasitic disease after eaten uncooked fish? 2. Record the results of pressing fish flesh and the dissection of the experimental animal Reference I. The fertilization process and egg formation In male, sperm produced in a pair of testes are collected in the seminal vesicle through the vas efferens and vas deferens and are ejected through the ejaculatory duct, around which there is a prostate gland covered by a cirrus sac. In female, a short oviduct comes out of the ovary and joins with the seminal receptacle and Laurers canal opening on the dorsal side, and further proceeds to the ootype with surrounding Mehlis'gland. Then, it becomes the uterus, which extends with many contortions to the common genital pore. Small ducts from the vitelline glands, gradually gather to become the right and left vitelline ducts and then one common vitelline duct, which opens at front of the ootype An egg cell from ovary and a sperm from testis are united, additional yolk cells provided by the vitelline gland join, and eggshell formation is started in the ootype by the effect of Mehlis' gland and completed during passage through the uterus. In the egg one miracidium has already been formed 2. Examine for encysted metacercaria in fish flesh4 the shape of distinct shoulders, a small protuberance at abopercular end, an asymmetrical miracidium inside the egg. One of the smallest helminth ova, yellow-brown, thicker eggshell. Material examined: feces and drawn liquid from duodenum. Examining method: see examination of alimentary helminths. (2) See the scanning electron-microscopic (SEM) photograph of ovum (Demonstration). 4. Pathology (1) See specimen, note the parasites in billiary passages (Demonstration). (2) See adult worms inhabiting in billiary passages of a reservoir host (Demonstration). Exercise 1. Draw egg of C. sinensis in detail. 2. Label in full an adult worm of C. sinensis. 3. Draw a life cycle draft of C. sinensis, including final host, intermediate host; adult parasitized site, main injured organs; excretory route of ovum, pathogenic diagnostic methods; the first and second intermediate hosts and in which how the larva development; the infective stage, infection mode and infection route. Thinking 1. Why one can obtain parasitic disease after eaten uncooked fish? 2. Record the results of pressing fish flesh and the dissection of the experimental animal. Reference 1. The fertilization process and egg formation In male, sperm produced in a pair of testes are collected in the seminal vesicle through the vas efferens and vas deferens and are ejected through the ejaculatory duct, around which there is a prostate gland covered by a cirrus sac. In female, a short oviduct comes out of the ovary and joins with the seminal receptacle and Laurer’s canal opening on the dorsal side, and further proceeds to the ootype with surrounding Mehlis’ gland. Then, it becomes the uterus, which extends with many contortions to the common genital pore. Small ducts from the vitelline glands, gradually gather to become the right and left vitelline ducts and then one common vitelline duct, which opens at front of the ootype. An egg cell from ovary and a sperm from testis are united, additional yolk cells provided by the vitelline gland join, and eggshell formation is started in the ootype by the effect of Mehlis’ gland and completed during passage through the uterus. In the egg one miracidium has already been formed. 2. Examine for encysted metacercaria in fish flesh