General Introduction 冷 Common saying“ round worm of man” so The largest of the intestinal nematodes parasitizing humans .o The most common worm found in human . o It is worldwide in distribution and most prevalent through out the tropics, sub-tropics and more prevalent in the countryside than in the city 13
General Introduction ❖ Common saying “round worm of man” ❖ The largest of the intestinal nematodes parasitizing humans ❖ The most common worm found in human ❖ It is worldwide in distribution and most prevalent through out the tropics, sub-tropics and more prevalent in the countryside than in the city 13
Morphology ☆ Adult: cR Cylindrical in shape c& Creamy-white or pinkish in color c& The female averages 20-35cm in length, the largest 49cm c& The male is smaller, averaging 15-31cm in length, has a typical curled tail with a pair sickle like copulatory spines cR On the tip of the head there are three lips, arranged as a chinese word“品” cR Male has a single reproductive tubule c& The female has two reproductive tubules and the vulva is ventrally located at the posterior part of the anterior 1/3 of the bod 14
❖ Adult: Cylindrical in shape Creamy-white or pinkish in color The female averages 20-35cm in length, the largest 49cm The male is smaller, averaging 15-31cm in length, has a typical curled tail with a pair sickle like copulatory spines On the tip of the head there are three lips, arranged as a Chinese word “ 品 ” Male has a single reproductive tubule The female has two reproductive tubules and the vulva is ventrally located at the posterior part of the anterior 1/3 of the body Morphology 14
Adult worm of a lumbricoides 15
Adult worm of A. lumbricoides 15
The lips of A lumbricoides The three lips are seen at the anterior end. The margin of each lip is lined with minute teeth which are not visible at this magnification 16
The lips of A. lumbricoides The three lips are seen at the anterior end. The margin of each lip is lined with minute teeth which are not visible at this magnification 16
Morphology Egg .o There are three kinds of the eggs c& fertilized eggs c& unfertilized eggs CR decorticated eggs We usually describe an egg in 5 aspects cR size, color, shape, shell and content
Egg ❖ There are three kinds of the eggs fertilized eggs unfertilized eggs decorticated eggs ❖ We usually describe an egg in 5 aspects size, color, shape, shell and content Morphology 17