Title: Phylum Aschelminthes | Introduction to Medical Parasitology
Headings: Introduction to Medical Parasitology
Phylum Aschelminthes
Class Nematoda
Generalized structure of male (A) and female (B) nematode
Introduction to Medical Parasitology

Content: The cloaca serves as a conduit for sperm and digestive wastes. Copulatory spicules protrude through the cloaca opening. The spicules, usually two in number, unite and form a tube through which spermatozoa are injected into the vulva and vagina of the female. Generalized structure of male (A) and female (B) nematode
Nematodes are classified into two subclasses: Phasmidia (have caudal sensory organs) and Aphasmidia (lack caudal sensory organs). The phasmids include most soil nematodes, most parasites of insects and vertebrates. The aphasmids are mainly aquatic forms and a few parasitic ones. Life cycle
Life cycles differ greatly among the many nematodes that are parasites of man. Mature female worms produce eggs, which pass out of the body with faeces. Most of the eggs are produced when they are not embryonated and become embryonated in the soil.