Let’s Prep 1. Read through the powerpoint and watch the dissection videos. 2. On a piece of white copy paper, draw the top and bottom of the starfish.

Starfish Dissection Let’s Prep1. Read through the powerpoint and watch the dissection videos.2. On a piece of white copy paper, draw the top and bottom of the starfish.3. Label the following parts on the drawing: Top Side- Aboral- Dorsal

a. Central Diskb. Madreporitec. Eyespotd. Arm/Raye. SpinesBottom Side- Oral- Ventralf. Mouthg. Ambulacral grooveh. Tube Feet

4. Draw a comic strip of a starfish eating a clam.5. Answer the following questions:

a. What class of invertebrates does a starfish belong to?b. Why do they now call it a seastar and not a starfish?c. What is the purpose of the tube feet?d. Describe the clean up procedure for the dissection.e. Summarize the 13 steps of the directions into one paragraph.

SafetyWear hair pulled backClosed Toe/Heel shoesNo dangling jewelryPush long sleeves upTake off jacketsAll books, binders etc. are to be left in locker

Dissection Tools Safety Tools Dissecting Pan

ScalpelDissecting scissors

ForcepsProbe

• Vinyl/Latex Gloves

• Apron• Safety

Goggles

The Starfish- ExternalTop Side- Aboral- Dorsal

Central DiskMadreporiteEyespotArm/RaySpines

Bottom Side- Oral- VentralMouthAmbulacral grooveTube Feet

Radial Symmetry

Tube Feet

Inside the Starfish2 Stomachs

Pyloric StomachCardiac Stomach

Digestive GlandsAmpullaeRing CanalReproductive Glands

Water Vascular SystemWater enters the madreporite, through the stone canal, into the ring canal, down through the ampullae into the tube feet to provide the suction

Steps1. Identify all external anatomy on aboral and oral

surfaces. - Madreporite, ambulacral groove, mouth, eyespot,

arm/ray, central disk, tube feet

2. On one arm, cut with scissors about 2 centimeters off.

3. Continue with the same arm, cut with scissors down both sides. Careful to cut only through the skin.

4. Cut along the top of the arm to cut off skin. Careful to not damage thecentral disk.5. Remove skin.

Steps6. Remove digestive and reproductive glands with forceps, place to the side.7. Examine ampullae.8. Using scalpel, cut through central disk(go around madreporite). Careful to not damage the stomachs.9. Remove central disk.10. Examine madreporite, find the stone canal that leads into the ring canal.11. Examine pyloric stomach. Find the canals that attach to the stomach and lead into each arm. Remove and set to the side.12. Examine the cardiac stomach. Remove and set to the side.13. Examine the mouth.

Clean UpThrow away starfish and all parts that were

removed into the large trash can.Wipe out the dissecting tray.Wipe off all tools except the scalpel.Wipe off tables.Put tray and tools back into center of table.Last period- group tools/tray on front counterRemove gloves and throw away.Remove apron and fold up. Place in stack with

others.When the entire table is clean, then you may ask

to wash your hands.

Videohttp://

www.youtube.com/watch?v=TioCree5axI&safety_mode=true&persist_safety_mode=1

http://www.youtube.com/watch?feature=iv&v=Xm2mF2IgLrA&src_vid=TioCree5axI&annotation_id=annotation_124424&safety_mode=true&persist_safety_mode=1