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| موضوع: البوم لبويضات ال Ascaris السبت 10 أبريل - 15:19:09 | |
| Ascaris lumbricoides unfertilized eggs.
Fertilized and unfertilized Ascaris lumbricoides eggs are passed in the stool of the infected host. Fertilized eggs are are rounded and have a thick shell with an external mammillated layer that is often stained brown by bile. In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45 to 75 µm in length. Unfertilized eggs are elongated and larger than fertile eggs (up to 90 µm in length). Their shell is thinner and their mammillated layer is more variable, either with large protuberances or practically none. Unfertile eggs contain mainly a mass of refractile granules.
| | A | B |
A: Unfertilized egg of A. lumbricoides. Note the prominent mammillations on the outer layer. B: Unfertilized egg of A. lumbricoides in an unstained wet mount, 200× magnification.
| | C | D |
C: Unfertilized egg of A. lumbricoides in an unstained wet mount of stool. D: Unfertilized egg of A. lumbricoides in a wet mount of stool. Note this specimen lacks the mammillated layer (decorticated).
| | E | F |
E, F: Infertile, decorticated eggs of Ascaris lumbricoides. Images courtesy of The Leiden University Medical Center, The Netherlands.
A. lumbricoides fertilized eggs.
Fertilized and unfertilized Ascaris lumbricoides eggs are passed in the stool of the infected host. Fertilized eggs are are rounded and have a thick shell with an external mammillated layer that is often stained brown by bile. In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45 to 75 µm in length. Unfertilized eggs are elongated and larger than fertile eggs (up to 90 µm in length). Their shell is thinner and their mammillated layer is more variable, either with large protuberances or practically none. Unfertile eggs contain mainly a mass of refractile granules. | | A | B | A, B: Fertilized eggs of A. lumbricoides in unstained wet mounts of stool, with embryos in the early stage of development. | | C | D | C: Fertilized egg of A. lumbricoides in an unstained wet mount of stool, undergoing early stages of cleavage. Image taken at 200× magnification. D: Fertilized egg of A. lumbricoides in an unstained wet mount of stool. | | E | F | E: Fertilized egg of A. lumbricoides in an unstained wet mount of stool, 200× magnification. A larva is visible in the egg. F: Fertilized egg of A. lumbricoides in an unstained wet mount of stool.
A. lumbricoides fertilized, decorticated eggs.Fertilized and unfertilized Ascaris lumbricoides eggs are passed in the stool of the infected host. Fertilized eggs are are rounded and have a thick shell with an external mammillated layer that is often stained brown by bile. In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45 to 75 µm in length. Unfertilized eggs are elongated and larger than fertile eggs (up to 90 µm in length). Their shell is thinner and their mammillated layer is more variable, either with large protuberances or practically none. Unfertile eggs contain mainly a mass of refractile granules. | | A | B | A, B: A. lumbricoides decorticated, fertile eggs in wet mounts, 200× magnification. | | C | D | C: A. lumbricoides decorticated, fertile egg in a wet mount, 200× magnification. The embryo has advanced cleavage. D: The same egg as in Image C, but at 400× Larvae of A. lumbricoides hatching fromeggs.
Larvae of Ascaris lumbricoides hatching from eggs. | | A | B | A, B: Larva of A. lumbricoides hatching from an egg. Life cycle of A. lumbricoides.
<table border="2"><tr> </tr> </table> Adult worms live in the lumen of the small intestine. A female may produce approximately 200,000 eggs per day, which are passed with the feces . Unfertilized eggs may be ingested but are not infective. Fertile eggs embryonate and become infective after 18 days to several weeks , depending on the environmental conditions (optimum: moist, warm, shaded soil). After infective eggs are swallowed , the larvae hatch , invade the intestinal mucosa, and are carried via the portal, then systemic circulation to the lungs . The larvae mature further in the lungs (10 to 14 days), penetrate the alveolar walls, ascend the bronchial tree to the throat, and are swallowed . Upon reaching the small intestine, they develop into adult worms . Between 2 and 3 months are required from ingestion of the infective eggs to oviposition by the adult female. Adult worms can live 1 to 2 years. | | |
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| موضوع: رد: البوم لبويضات ال Ascaris الأربعاء 17 نوفمبر - 11:31:14 | |
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| موضوع: رد: البوم لبويضات ال Ascaris الأربعاء 17 نوفمبر - 13:26:42 | |
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عين النسر المدير العام
رقم العضوية : 1 عدد المساهمات : 2247 نقاط : 15898 تاريخ التسجيل : 25/02/2010
| موضوع: رد: البوم لبويضات ال Ascaris الأربعاء 17 نوفمبر - 23:48:32 | |
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| موضوع: رد: البوم لبويضات ال Ascaris الخميس 18 نوفمبر - 22:42:50 | |
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| موضوع: رد: البوم لبويضات ال Ascaris الإثنين 29 نوفمبر - 18:22:21 | |
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| موضوع: رد: البوم لبويضات ال Ascaris الإثنين 27 ديسمبر - 14:12:23 | |
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