In this lab, you will study the external and internal anatomy of a fresh or frozen crab.
Observe how the different pairs of appendages are modified for various functions.
You will need to remove the top of the carapace, the main body covering of the animal.
You can use heavy scissors, or an electric tool fitted with a grinding or cutting wheel.
Cut along the perimeter, being careful not to damage the underlying organs.
 
The next step is to remove the dark skin layer that covers the internal organs.
Cut out one side of the exoskeleton on a claw, and remove the muscle tissue to expose
the inner workings of the claw.
Muscle contractions open and close the claw.
Which claw muscles are more powerful?
The following footage of different types of crabs is silent, so teachers can point out features and discuss the onscreen questions with students during the video.
