Question

Describe the internal structure of body wall of earthworm

Answer 1

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The body wall of earthworm is thin soft and moist. It consists of the following layers arranged from outside.

Cuticle: It is a thin, transparent, iridescent layer secreted by the underlying epidermis. Epidermis : It is in the form of a single layer of columnar cells. This layer contains gland cells and receptor cells.

Dermis: It is a very thin sheet of connective tissue forming a basement for the epithelial cells on the outside and muscles on the inside.

Muscles: The muscles are arranged in two layers, namely the outer circular and inner longitudinal.

Coelomic epithelium: It is the inner most layer of the body wall forming the lining of the body cavity.



Body Cavity: A spacious body cavity called the coelom is seen between the alimen-tary canal and the body wall. It is divided into a series of compartments by the transverse partitions of connective tissue called the septa. The coelom is lined with the coelomic epithelium and filled with coelomic fluid. It is a colourless fluid with amoeboid coelomic corpuscles floating in it. The fluid oozes out through the dorsal pores. It keeps body surface moist as a condition quite essential for respiration. The coelomic cavity communicates to the exterior through reproductive and excretory apertures. The germ cells are budded off from the wall of this cavity.



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