Worm Anatomy

A worms body is made up of many segments called annuli. There is a small tongue like lobe just above the mouth called the prostomium see figure 1.

Earthworms

Worm anatomy physiology.

Worm anatomy. Anatomy of an earthworm. The annuli are covered in tiny hairs called setae which help the worms movement. The first segment of the earthworm the peristomium see figure 1 contains the mouth.

To understand a worm anatomy and physical functions it is also a good idea to understand its purpose and function in nature. Look at the labeled picture to help you find the following features. Lay the worm on your dissecting tray with its dorsal side facing up.

Earthworm have a dual circulatory system in which both the coelomic fluid and a closed circulatory system carry the food waste and respiratory gases. Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands. The length of a worms body has muscles which contract and relax which enables the worm to move along a surface.

Finish cutting the. A worm has three major duties in life eat poop and mate. Using the forceps and dissection pins carefully pull apart the two flaps.

It truly plays a huge role in the creation and design of our ecosystem. Not necessarily in that order the worm has a pointed head and a slightly rounded body. While we dont fully understand all the functions of the nervous system it is believed that body functions such as reproduction and life cycles are regulated within the nerve ganglion.

The worm relies on the ganglion and a ventral nerve cord for sensory input from the world around them.

Earthworm Dissection