As the title indicates this post is all about frog guts. Don’t complain to me if you don’t like what you see. You knew what was coming. 🙂
This is my last gut post for this year. So enjoy it!
Module 13, experiment 13.2 is the Frog Dissection. In this experiment the students are suppose to find their own protocol. Protocol is the instructions on dissecting whatever you are dissecting. In this case it is the frog. For the second year, this has been a disaster.
Most of my students either lost it, couldn’t find anything on the internet, dog ate it, or flushed it down the toilet. So next year, I am writing up their protocols. I’m more interested in them learning about the frog, than finding their own protocol. I walked them through it this year and we ran out of time.
The specimens were a mess. I will not be ordering from this company again. But we did work with what we had.
First we take a look at the outside of the frog. Note, size, color, shape, guess the gender, etc.
The size of the tympanum membrane and the thumbs on the front legs is a good way to determine the sex of the frog. Of course this is not always accurate. If the tympanum membrane and/or the thumb are large, it is a male. According to my students we had all males and one female.
They were wrong. After making our first incisions, we found eggs. If I am not mistaken, correct me if I am wrong, only females can have eggs. A whole mess of eggs. Nasty eggs. Every.where.eggs! But cool looking.
The eggs needed to be removed in order to look at the organs. That was a fun job and I’m glad I didn’t have to do it. LOL
Here is what it should look like without eggs. This one had no eggs, but some had eggs hidden under the organs.
After looking at what we could, some of the students started removing the liver, intestines and other things to see what was underneath.
One of the frogs had an impressive amount of fat bodies. Fat bodies are used to store food/nutrients for hibernations or when there is a lack of food. If you look just below the intestines, you’ll see some eggs. You have my permission to print and frame this for your kitchen. 😀
Speaking of food, the stomach was opened up to see what was the last meal. I really didn’t think we would find anything but…
this was found. Do you know what it is?
I wish we had more time than 1.5 hours to dissect an specimen. There isn’t enough time to dissect, take notes, sketch, etc.
I will be doing some things different next year. 🙂
Not enough frog guts for you? Then read about last year’s Frog dissection 2010.