Worm Internal Anatomy

At the very front of an earthworm you will find the pharynx. Earthworm dissection picture guide.

Worm Dissection Tenaglia Biology 2015 16

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Worm internal anatomy. It is to be noted that the body of the earthworm is essentially a double tube. General anatomy of a polychaete the outer surface of the body wall consists of a simple columnar epithelium covered by a thin cuticle. Internal anatomy of earthworm.

The worm is darker on its upper surface. Other reproductive parts appear as small white organs on the ventral side of the hearts. Set of nerves in the abdomen of an earthworm.

One or more pairs of spermathecae are present in segments 9 and 10 depending on the species which are internal sacs that receive and store sperm from the other worm during copulation. If a worm is cut open from the anterior to the posterior end by an incision through the body wall in the mid dorsal line the internal structures may easily be studied. Internal earthworm anatomy.

External dorsal surface of worm 1. Earthworms push the pharynx from inside their mouths to grab hold of things. Test your knowledge about anatomy of a common earthworm with this online quiz.

Start your dissection about an inch posterior to the clitellum. What is the internal anatomy of an earthworm. Internal morphology overview 4 images.

Part of the digestive tract of an earthworm just after its mouth. The light colored tissue above and around the hearts are seminal vesicles. Entrance to the digestive tract of an earthworm.

A trivia quiz called anatomy of a common earthworm. They pull food into their mouths and then soak it in saliva. As a result segment 15 of one worm exudes sperm into segments 9 and 10 with its storage vesicles of its mate.

Insert the scissors into the opening and cut in a straight line all the way up through the mouth. Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors. Use dissection pins to secure each end on the tray.

Internal anatomy of an earthworm lateral section. Small long cylindrical animal without legs or hard body parts. The arrow points to the worms clitellum an organ responsible for mucus production during reproduction.

Lay the worm on your dissecting tray with its dorsal side facing up. The dark line shows the location of the dorsal blood vessel. Underneath this in order are a thin layer of connective tissue a layer of circular muscle a layer of longitudinal muscle and a peritoneum surrounding the body cavity.

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