Earthworms Anatomy

Annelida in latin means little rings the body of the earthworm is segmented which looks like many little rings joined or fused together. It has a double transport system made of coelomic fluid that moves within the fluid filled coelom and a simple closed circulatory system.

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What is the internal anatomy of an earthworm.

Earthworms anatomy. 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. Its central nervous system consists of two ganglia above the m. The earthworm is made of about 100 150 segments.

At the very front of an earthworm you will find the pharynx. Instead of inhaling and exhaling like us the exchange of these gases in and out of the earthworm takes place passively through the skin. Earthworms are classified in the phylum annelida or annelids.

The alimentary canal is a long tube running from first to the last segment. Morphology of earthworm anatomy. The first segment of the earthworm the peristomium see figure 1 contains the mouth.

Internal anatomy of earthworm. It is to be noted that the body of the earthworm is essentially a double tube. An earthworm is a tubular segmented worm of the phylum annelida.

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 use the prostomium to see their environment as earthworms have no eyes ears nose or hands. Anatomy of an earthworm.

Earthworms have a closed circulatory system constituting a heart. There is a small tongue like lobe just above the mouth called the prostomium see figure 1. It respirates through its skin.

They occur worldwide and are commonly found in soil eating live and dead organic matter. Earthworms push the pharynx from inside their mouths to grab hold of things. Externally a thin non cellular cuticle covers the body wall of the earthworm.

It has a central and a peripheral nervous system. An earthworms digestive system runs the length of its body.

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