The internal anatomy of a crayfish is very similar to that of a lobster. The crayfish has 8 jointed walking legs, a segmented body, 2 pairs of sensory antennae, and compound eyes. Extensor muscles: muscle that extends the tail of the crayfish. The crayfish has an open circulatory system in which the blood flows from arteries into sinuses, or spaces, in tissues. The head and thorax are fused, forming the cephalothorax. Using one hand to hold the crayfish dorsal side up in the dissecting tray, use the scissors to carefully cut through the back of the carapace along the dissection cut line #1 (as seen below on the diagram). Heart: blood-pumping organ of the crayfish. The gills, which are feather-like structures found underneath the carapace and attached to the chelipeds and walking legs, are the organs of the respiratory system.. A constant flow of blood to the gills releases carbon dioxide and picks up oxygen. Gonad: sex gland of a crayfish. Add to Playlist 1 … 21. 0. Locate the dorsal tubular heart and several arteries. 2. Internal anatomy of a crayfish: edible freshwater crustacean, with pincers on the two forelegs. It has 2 large pincers or claws called chelipeds. You may use your book diagrams to help you locate the organs. The crayfish has an open circulatory system in which the blood flows from arteries into sinuses, or spaces, in tissues. Choose from 107 different sets of crayfish internal flashcards on Quizlet. 1. Locate the dorsal tubular heart and several arteries. In the crayfish anatomy video below, the gills are shown, although the narrator never refers to them. Get started! With a strong pair of scissors, cut the carapace away from the right side of the head and thorax. Learn crayfish internal with free interactive flashcards. If a crayfish loses a leg, the leg will regenerate (regrow). Place the specimen in the dissecting tray dorsal side up. Crayfish Internal Anatomy In addition to the diagram on the next page, there are labeled photographs of the internal anatomy of a preserved crayfish on page 186 of the Photographic Atlas. Online quiz to learn Male Crayfish Internal Anatomy; Your Skills & Rank. Internal Anatomy of the Crayfish Directions: Follow the directions step-by-step, locating each of the ... you start this dissection). Advertisement. Use the diagram of the internal anatomy of the crayfish to locate and identify the organs of the circulatory system. The gills are the segmented clumps of tissue on each side of the crayfish above the walking legs. Using gills, a crayfish breathes oxygen that is dissolved in water. Stomach: part of the digestive tract between the esophagus and the intestine. You may want to review or reference terms you don't ... diagrams to help you locate the organs. Some of the worksheets for this concept are Crayfish pre lab work, Crayfish dissection, Crayfish dissection, Fish id key, Lab 6 phylum arthropoda, Bony fish anatomy work, Earthworm anatomy answer key, Echinoderm dissection guide and lab answers. They look like clumps because they are dried out and stuck together. Today 's Points. *Check the box next to the number when you have completed that step. Actions. Total Points. Internal Anatomy of the Crayfish Directions: Follow the directions step-by-step, locating each of the structures in the order they appear in the directions. You need to get 100% to score the 21 points available. Encephalon: site of the mental functions of a crayfish. Crayfish External Diagram 2 Crayfish Internal Diagram Grasshopper Diagram External Grasshopper Diagram Internal Chapter 17 Vocab 17A (Madi) Chapter 18. Crayfish Internal Anatomy Answers - Displaying top 8 worksheets found for this concept.. 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