Earthworm Anatomy

The first segment of the earthworm the peristomium see figure 1 contains the mouth. Externally a thin non cellular cuticle covers the body wall of the earthworm.

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What is the external anatomy of an earthworm.

Earthworm anatomy. An earthworm is a tubular segmented worm of the phylum annelida. Earthworms are classified in the phylum annelida or annelids. There is a small tongue like lobe just above the mouth called the prostomium see figure 1.

An earthworms digestive system runs the length of its body. Every segment of the body excepting the clitellar and the first and last. Annelida in latin means little rings the body of the earthworm is segmented which looks like many little rings joined or fused together.

The alimentary canal is a long tube running from first to the last segment. Morphology of earthworm anatomy. It secretes the material for producing cocoons.

Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands. 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.

They occur worldwide and are commonly found in soil eating live and dead organic matter. The earthworm is made of about 100 150 segments. Its central nervous system consists of two ganglia above the m.

Instead of inhaling and exhaling like us the exchange of these gases in and out of the earthworm takes place passively through the skin. The skin of segments fourteenth fifteenth and sixteenth is swollen and pale in mature worms to form a saddle shaped structure called clitellum or cingulum. It has a central and a peripheral nervous system.

External anatomy of earthworm. It respirates through its skin. The very first section of the anterior contains the mouth and prostomium.

Anatomy of an earthworm. The front or head of the worm is called the anterior. It has a double transport system made of coelomic fluid that moves within the fluid filled coelom and a simple closed circulatory system.

Models and microscope slides of the main parts on an earthworm. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects.

Sketch Of Earthworm Anatomy