Tuesday, May 27, 2014



Purpose: The whole purpose and why we are doing this lab in the first place was to learn about the anatomy of different specimens. In this lab what concepts that were being tested i would assume was the idea of different specimens have different inner and outer parts that make them all different. For independent and dependent variables there were the specific inner organs that were outlined in guilds to find. Other than that there wasn't anything that we had to measure but more of the point of this lab was to observe the dissection process and demonstrate understanding.

Intro: In this lab we had to choose 4 out of the 6 specimens given to us to dissect and learn about the inner and outer parts and its functions. The specimens that we had to choose were the frog, starfish, clam, and perch which is a type of fish for people that don't know. In each specimen shown in this blog we will discuss the procedures we did and then explain the importance of body parts inside and outside of the specimen. Furthermore there will be videos and pictures of each specimen that will help walk through anyone that needs help with dissection of these certain specimens. Having said all of this let us begin with the frog which was the first specimen we dissected.

Methods: Our methods will be put into videos of breaking down the whole dissection. 

Frog (Chau):
Internal parts taken out 
First opening showing liver

part of the frogs mouth


Video Link to frog dissection


Starfish (Gunnar):
External Anatomy:

External anatomy (parts with definitions):

Dorsal/aboral fin: Primary arm.

Arms: Used for general movement.

Central disc: Activity center of the starfish. Contains the mouth.

Spines: Some used to absorb oxygen. Others are used to clean the surface of the skin.

Eyespots: Used to detect light and its general direction so they have some idea of where they are going.

Mouth: Used for eating.

Soft tube feet: Used for specific movement.

Ambulacral groove: Houses/Protects the soft tube feet

Internal anatomy:

Internal anatomy (parts with definitions):

Pyloric caeca: Long digestive glands that make enzymes to digest food in the stomach.

Gonads: Used for reproduction

Ring Canal: A circular canal in which filtered water enters through the madreporite and branches out into the radiated canals.

Lateral canal: Holds the soft tube feet in place.

Ossicles: Skeletal plates for protection.

Madreporite: Allows water to enter into the water vascular system

Incision Guide (for dissection):
(Some incisions are lined in blue and may be hard to see)

Starfish Dissection Video:

Video Link:


Clam (Luke):

External/Internal Diagram:

External Parts:

Dorsal Side: Back side. Contains Umbo and Hinge Ligament
      Umbo: Oldest part of the clam
      Hinge Ligament: Holds clam together

Ventral Side: Front/ Mouth of the clam

Siphon: Brings in water/food

Anterior/Posterior Sides: Right and left sides of the clam, respectively

Internal Parts:

Adductors: Hold Clam open/ Close Clam

Gill: Allows Clam access to oxygen for respiration

Foot: Muscle that the clam uses to move around and burrow

More Internal Parts:

Mantle: Soft tissue coating the inside of clam

Esophagus: Moves food to stomach

Stomach: Digests and breaks down food

Reproductive Gland: Clam uses this to produce offspring


In order to cut open the Clam, just cut the adductors on both sides. Marked below.



Perch (Derek)

Incision Guide Reference

   External Anatomy

   Internal Anatomy


Conclusion: Overall the lab was engaging as we got to experiment then actually apply our knowledge in teaching others about our dissections of different specimen. Each one of us had the chance to dissect and were fascinated at the type of organs and parts of each specimen compared to another.