OVA Examination

• What are the 3 egg types of Ascaris lumbricoides used in ova examination?

  Unfertilized, fertilized, decorticated.
• Fertilized ova: rounder and smaller
• What are the 3 layers of a fertilized ova of Ascaris lumbricoides?

  Internal Lipoidal Vitelline membrane, middle transparent glycogen layer, and outer coarsely mammilated albuminous layer
• What is the supporting structure among the 3 layers in a fertilized A. lumbricoides ova?

  Middle transparent glycogen layer
• How long will it take for a fertilized A. lumbricoides ova to fully developed in larvae?

  14 days or 2 weeks
• Unfertilized ova: longer and narrower
• Unfertilized ova: No glycogen membrane
• What type of ova has a CORTICATED outer layer?

  Unfertilized
• The inner layer of an unfertilized A. lumbricoides ova is made up of what?

  thin chitin shell
• Decorticated: no outer albuminous layer
• What type of ova has a THICK MIDDLE GLYCOGEN LAYER?

  Decorticated
• Identify the following:

  A) Fertilized Corticated Ova of Ascaris lumbricoides

  
• Identify the following:

  A) Fertilized Decorticated ova of ascaris lumbricoides

  
• Identify the following:

  A) Unfertilized corticated ova of ascaris lumbricoides

  
• Identify the following:

  A) Unfertilized decorticated ova of ascaris lumbricoides