The earthworm has two muscles which it uses for movement. the both of them run through the worm's body. the two muscles are the longitudinal muscles and the circular muscles. the longitudinal muscles cradle the coelom, a fluid-filled body cavity formed from the splitting of lateral plate mesoderm during embryonic movement. when the circular muscles contract, the diameter of the body is reduced, making the worm short. this shows that when an earthworm becomes thin both of their muscles are contracted. they use these muscles to move in a wavy form.
1.) Circular Muscle Layer
2.) Cuticle
3.) Setae
4.) Longitudinal Muscles
5.) Epidermis
2.) Cuticle
3.) Setae
4.) Longitudinal Muscles
5.) Epidermis