Nematodes --General information Department of Medical Parasitology
Nematodes --General information Department of Medical Parasitology
Classification and Species Nematodes are multicellular animals belong to Phylum Nemathelminthes, Class Nematoda The number of nematode species is estimated at half a million,most of them are“free-living”types Few are best known in the parasitic realm,35 species are reported human parasitic
Classification and Species • Nematodes are multicellular animals belong to Phylum Nemathelminthes, Class Nematoda • The number of nematode species is estimated at half a million, most of them are “free-living” types • Few are best known in the parasitic realm, 35 species are reported human parasitic
Classification and Species Common human nematodes: Ascaris lumbricoides Ancylostoma duodenale Necator americanus (hookworm) Trichuris trichiura (whipworm) Enterobius vermicularis (pinworm) Wuchereria bancrofti Brugia malayi (filaria Trichinella spiralis Strongyloides stercoralis,etc
Common human nematodes: Ascaris lumbricoides Ancylostoma duodenale Necator americanus (hookworm) Trichuris trichiura (whipworm) Enterobius vermicularis (pinworm) Wuchereria bancrofti Brugia malayi (filaria ) Trichinella spiralis Strongyloides stercoralis, etc. Classification and Species
Characteristics of Nematodes Elongated,cylindrical unsegmented worms;bilaterally symmetrical;taper towards their anterior and posterior ends 烧电成
Characteristics of Nematodes • Elongated, cylindrical unsegmented worms; bilaterally symmetrical; taper towards their anterior and posterior ends
Characteristics of Nematodes Ascaris Ancylostoma Entrobius Strongyloides ·Range in Trichuris Necator Trichinella length from a few millimeters to many Actual Sizes of Females centimeters Nematodes:relative size
Characteristics of Nematodes • Range in length from a few millimeters to many centimeters Nematodes: relative size
Characteristics of Nematodes Dioecious.The female adult is bigger than the male adult,the tail of male adult is curled or expends out to form a bursa,but the terminate of female adult is straight and slender /
Characteristics of Nematodes • Dioecious. The female adult is bigger than the male adult, the tail of male adult is curled or expends out to form a bursa, but the terminate of female adult is straight and slender
Characteristics of Nematodes ·Pseudocoelom Body wall consists of three layers:cuticle, hypodermis and an inner layer of muscle cells lateral cord cuticle digestive hypodermis tract musculature reproductive organs
cuticle digestive tract lateral cord reproductive organs hypodermis Characteristics of Nematodes • Pseudocoelom • Body wall consists of three layers: cuticle, hypodermis and an inner layer of muscle cells musculature
The arrangement of the somatic muscles is of value in the systematic grouping of nematodes 公 C polymyarian meromyarian holomyarian Ascaris Hookworm Whipworm
The arrangement of the somatic muscles is of value in the systematic grouping of nematodes polymyarian meromyarian holomyarian Ascaris Hookworm Whipworm
Characteristics of Nematodes Complete digestive tract mouth opening esophagus intestine rectum anus or buccal cavity
• Complete digestive tract Characteristics of Nematodes mouth opening or buccal cavity esophagus intestine rectum anus
Characteristics of Nematodes ·Reproductive system Male -single tube type Female -double tube type female vagina testis male uterus seminal vesicle oviduct vas deferens ovary ejaculatory duct
testis seminal vesicle vas deferens ejaculatory duct ovary oviduct uterus Characteristics of Nematodes • Reproductive system Male -- single tube type Female -- double tube type female vagina male