Structure of ascaris lumbricoides explained with diagram of ascaris blog post explains about classification of ascaris, Ascaris lumbricoides Structure, Life Cycle of Ascaris lumbricoides with ascaris male and female diagram.
Ascaris species are parasites that live in the human intestine. Adult females are 20 to 35 cm long, and adult males are 15 to 30 cm long. A. lumbricoides is the main species that causes infections in humans around the world, but Ascaris that comes from pigs can also cause infections in humans.
Classification of Ascaris
Ascaris lumbricoides Structure
Ascaris is in the group called Aschelminthes. People often call them “roundworms.” They are the same on both sides, and they have a pseudocoelom. The males and females are different, and the females are longer (take a look at ascaris male and female diagram). The digestive tract is well-formed, and the pharynx is strong. Through an excretory pore, waste is let out of the body. Take a look at an ascaris diagram for better understanding.
Diagram of Ascaris Lumbricoides: Ascaris Labelled Diagram
Ascaris Male Diagram
Ascaris Female Diagram
Life Cycle of Ascaris
Life Cycle of Ascaris
1. Worms live in the opening of the small intestine when they are adults (take a brief look at ascaris lumbricoides diagram). A female can lay up to 200,000 eggs a day, which are then passed through the faeces. Unfertilized eggs may be ingested but are not infective.
2. Depending on the environmental conditions (optimum: moist, warm, shaded soil), larvae develop to infectivity within fertile eggs in 18 days to several weeks. After swallowing infective eggs, the larvae hatch, invade the intestinal mucosa, and are carried to the lungs via the portal and systemic circulation. The larvae continue to mature in the lungs (10 to 14 days), penetrating the alveolar walls, ascending the bronchial tree to the throat, and being swallowed.
3. When they reach the small intestine, they mature into adult worms. From the time the infective eggs are consumed to the time the adult female oviposit, it takes between 2 and 3 months. Adult worms can live for one to two years.
Clinical Importance of Ascaris
Although severe infections in children can result in stunted growth due to malnutrition, adult worms rarely cause acute symptoms. In severe infections, high worm burdens can cause abdominal pain, intestinal obstruction, and possibly perforation. Adult worms migrating may cause symptomatic biliary tract occlusion, appendicitis, or nasopharyngeal expulsion, especially in infections involving a single female worm.
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