Medical Helminthology Termatoda Cestoda Nematoda PHYLUM NEMATHELMINTHES Class

Medical Helminthology Termatoda Cestoda Nematoda

PHYLUM: NEMATHELMINTHES Class: NEMATODA

General Characters of Nematodes

Nerve cord Nerve fiber Cuticle Subcuticle Lateral excretory canal Muscles Dermal, muscular, nervous, excretory systems

Alimentary tract

Types of oesophagi in nematodes Clube shaped

Double bulbed

Rhabditiform

Cylindrical or filariform

Cellular

Reproductive system Vulva Vagina Testis Ovary Seminal recepatacle 2 Uteri S. V. 2 copulatory specules Ovi duct Female system V. D. Rectum Cloaca Male system

Nervous system

Features of life cycle of Nematods

Free phase To Intermediate host

Intermediate Host =Definitive host x

Infective stage Ova Larvae

Female worm Oviparous Ovoviviparous Viviparous

Mode of infection Orally Skin invasion Auto infection

Mode of infection Orally

Mode of infection Skin invasion

Mode of infection Auto infection

Types of nematode larvae Rhabditiform oesophagus Rhabditiform larva Filariform oesophagus Filariform larva

Molting of nematode larvae 3 rd 1 st 2 nd 4 th

Sites of Molting of nematode larvae

CLASSIFICATION OF NEMATODE (according to its final habitat) Intestinal Nematodes Small intestine Large intestine Tissue Nematodes