Anatomy Of The Earthworm
Use a hand lens as you observe all parts of the worm externally and internally. The body of pheretima is nearly circular in cross section and varies from 7 to 8 inches 18 19 cms in length.
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The alimentary canal is a long tube running from first to the last segment of the body.
Anatomy of the earthworm. Earthworms do not have eyes. Place earthworm in the dissecting tray rinse off the excess preservative. External anatomy of earthworm.
Put on safety goggles gloves and a lab apron. Anatomy of earthworm digestive system. A dark line extends from end to end in the mid dorsal line.
External anatomy examine your earthworm and determine the dorsal and ventral sides. Anatomy form and function. Locate the conspicuous.
Identify the dorsal side which is the. The general colour of the body is brown but the dorsal surface is darker. Depending on the species an adult earthworm can be from 10 mm 0 39 in long and 1 mm 0 039 in.
Locate the two openings on the ventral surface of the earthworm the openings toward the anterior of the worm are the sperm ducts the openings near the clitellum are the genital setae. Earthworms reproduce by laying a cocoon a sac that contains the earthworm s eggs the cocoon is formed at the clitellum and then travels from the clitellum to the head once it reaches the head the cocoon slides off the earthworm s body and is deposited. Earthworms have a closed circulatory system constituting a heart blood vessels and capillaries.
Earthworms lack a. Other stages in the life of an earthworm. The cns consists of a bilobed brain cerebral ganglia or supra pharyngeal ganglion sub pharyngeal.
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