Earthworms Anatomy

There is a small tongue like lobe just above the mouth called the prostomium see figure 1. Its central nervous system consists of two ganglia above the m.

Earthworm Anatomy External Features

It is to be noted that the body of the earthworm is essentially a double tube.

Earthworms anatomy. They occur worldwide and are commonly found in soil eating live and dead organic matter. At the very front of an earthworm you will find the pharynx. An earthworms digestive system runs the length of its body.

Annelida in latin means little rings the body of the earthworm is segmented which looks like many little rings joined or fused together. Instead of inhaling and exhaling like us the exchange of these gases in and out of the earthworm takes place passively through the skin. It has a central and a peripheral nervous system.

It has a double transport system made of coelomic fluid that moves within the fluid filled coelom and a simple closed circulatory system. Internal anatomy of earthworm. Earthworms have a closed circulatory system constituting a heart.

An earthworm lacks any kind of lungs but like any other aerobic organism it still needs oxygen to carry out essential processes and to rid itself of carbon dioxide that builds up as waste. Earthworms are classified in the phylum annelida or annelids. An earthworm is a tubular segmented worm of the phylum annelida.

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. It respirates through its skin. Earthworms push the pharynx from inside their mouths to grab hold of things.

Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands. Morphology of earthworm anatomy. The alimentary canal is a long tube running from first to the last segment.

The first segment of the earthworm the peristomium see figure 1 contains the mouth. The earthworm is made of about 100 150 segments. What is the internal anatomy of an earthworm.

Anatomy of an earthworm. Externally a thin non cellular cuticle covers the body wall of the earthworm.

Earthworms