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Preview to Frog Dissection
Objective: Students who cannot perform the actual frog dissection can use this alternative to learn the parts of the frog and receive credit for the dissection. Keep in mind, there is no substitute for actually viewing the real structures on the frog and having the real experience of dissection. Many students will remember the frog dissection long after they have left school. However, it is understood that some students opt out for moral reasons, or some cannot complete the dissection due to health reasons. This project has three parts, to be completed by the student on their own time, using a computer and an internet connection.
Part I - Dissection of the Frog without the Frog
There are many simulations available online, and your first step is to complete two virtual dissections.
Site 1 - Go to MHHE Virtual Frog Dissection and complete the module.
Between the two virtual dissections, you should have a good idea of how frog dissections are performed and may have been able to answer many of the questions in the lab handouts. To show that you have completed the dissections, answer the following questions, you will turn these questions in to your teacher.
1. Describe the procedure you would use to cut the frog to expose the organs to view. You may include drawings to explain the technique.
2. Describe the inside of the frog's mouth. What structures are visible and what are their functions? You may also include drawings.
3. Describe what you first see when you open the body cavity of the frog. What organs are obvious? Which organs may require a more thorough inspection?
4. Compare a male to a female frog. How can you tell the difference?
5. Choose one organ that you would find in the body cavity of the frog. Describe it in thorough detail, explain what it does, where it is located and how you would find it in the frog, you may want to sketch the organ to show its locations in relation to the other organs.
Part II - Completing the Lab Guides
Students in class were required to follow a lab guide, follow the instructions and answer questions. This is still a requirement for those not actually in class and working on the frog. Print the following handouts (or your teacher may have given them to you already.)
Some of the answers you will already know from completing the virtual dissection. Follow the handouts as you view the following frog galleries and slideshows. The photo captions will help you stay on track and answer the questions.
Gallery 1 - External Anatomy of the Frog
(Click on the left icon to show captions, you may need to pause and advance manually). If slideshow is not working, go to the Frog External Anatomy gallery at picasaweb.
Gallery 2 - Frog Dissection
Gallery 3 - Brain & Legs
If slideshow is not working, go to the Frog Brain (Virtual) gallery at picasaweb.
Part III - Preparation for the Lab Test
Students in class will be taking a test over the frog where they will need to identify structures on a dissected and pinned frog.
You will either be doing this with the class or taking the online version of the lab test - see your instructor for details. To prepare for the test, visit the Ultimate Frog Anatomy Review for practice tests. Print out a copy of the frog labeling review guides to complet and turn in to your instructor.
*Instructors can make an online test using photos from the frog dissection gallery or other sites that share dissection images.