Earthworm Dissection Photo Credit All photos taken from

• Cuticle – keeps the worm from drying out

• Clitellum- makes mucus that dries up to form a cocoon

• Prostomium – covers the mouth of the worm

• Mouth- opening at the end allowing the intake of food consisting of

• Setae – bristle like structures that help the worm move

• Sperm Duct – openings in which sperm can pass through

• Sperm groove – sperm moves along here from sperm duct to another

• Anus – where excrement (poop) comes out

Circulatory System Dorsal blood vessel Aortic arches Ventral blood vessel Go To Nervous System

Nervous System • Ganglion- group of nerves. In the earthworm, there is a pair

Excretory System • Nephridium- filters wastes. Almost each segment of the worm has a

Digestive System • Food goes from the: Mouth Pharynx Esophagus Crop Gizzard Intestine Anus

• Seminal vesicles- store sperm produced by the earthworm

• Seminal receptaclespaired organs that store sperm received from another worm during copulation

How do Earthworms Mate? • Earthworms are hermaphrodites which means they have both mail

• As they do this the tube passes over the sperm ducts and

• And mixes with eggs that come out of the oviduct

• When free of the slime tube, the cocoon closes up and the

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Earthworm Dissection Photo Credit: All photos taken from http: //www. flushing. k 12. mi. us/srhigh/mignerey/web%20 dissections/earthworm%20 web/Frameset. htm Some content from: http: //www. scienceclass. com/dissect/teacher_materials/glossary/earthworm_glossary. html Various videos from both www. youtube. com and www. arkive. com

External Anatomy

• Cuticle – keeps the worm from drying out

• Dorsal – top part

• Ventral – bottom part

• Clitellum- makes mucus that dries up to form a cocoon

• Prostomium – covers the mouth of the worm

• Mouth- opening at the end allowing the intake of food consisting of particles of both living and dead substances

• Setae – bristle like structures that help the worm move

• Sperm Duct – openings in which sperm can pass through

• Sperm groove – sperm moves along here from sperm duct to another worm

• Oviduct- tube through which eggs pass

• Anus – where excrement (poop) comes out

Internal Anatomy

Circulatory System Dorsal blood vessel Aortic arches Ventral blood vessel Go To Nervous System

Nervous System • Ganglion- group of nerves. In the earthworm, there is a pair of ganglia in each segment and a cerebral ganglia acts like a brain

Excretory System • Nephridium- filters wastes. Almost each segment of the worm has a pair of nephridia.

Digestive System • Food goes from the: Mouth Pharynx Esophagus Crop Gizzard Intestine Anus

• Anus – where excrement (poop) comes out

Reproductive System

• Seminal vesicles- store sperm produced by the earthworm

• Seminal receptaclespaired organs that store sperm received from another worm during copulation

How do Earthworms Mate? • Earthworms are hermaphrodites which means they have both mail and female body parts

• Worms line up head to tail

• Slime coats the clitellum

• As they do this the tube passes over the sperm ducts and picks up sperm

• Down the sperm groove

• And mixes with eggs that come out of the oviduct

• When free of the slime tube, the cocoon closes up and the sperm and eggs mix. • This sac is carried by a worm until baby worms have developed, at which point the sac breaks open and they squirm free.