Earthworm Anatomy

External anatomy of earthworm. Morphology of earthworm anatomy.

Earthworm Model Dissection Model Of Earthworm Anatomy Earthworm Model Buy Earthworm Model Anatomy Earthworm Model Dissection Model Of Earthworm

It secretes the material for producing cocoons.

Earthworm anatomy. Anatomy of an earthworm. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects. The alimentary canal is a long tube running from first to the last segment.

It has a double transport system made of coelomic fluid that moves within the fluid filled coelom and a simple closed circulatory system. 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.

The very first section of the anterior contains the mouth and prostomium. An earthworm is a tubular segmented worm of the phylum annelida. It respirates through its skin.

They occur worldwide and are commonly found in soil eating live and dead organic matter. There is a small tongue like lobe just above the mouth called the prostomium see figure 1. 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.

Annelida in latin means little rings the body of the earthworm is segmented which looks like many little rings joined or fused together. Earthworms have a closed circulatory system constituting a heart. It has a central and a peripheral nervous system.

The front or head of the worm is called the anterior. An earthworms digestive system runs the length of its body. Earthworms are classified in the phylum annelida or annelids.

Its central nervous system consists of two ganglia above the m. 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. What is the external anatomy of an earthworm.

Models and microscope slides of the main parts on an earthworm. Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands. Every segment of the body excepting the clitellar and the first and last.

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 earthworm is made of about 100 150 segments.

Earthworm Anatomy Outline