Zoology Practical #2 Earthworm

Cerebral ganglion

Brain; controls movement + behavior

Pharynx

Suction pump; muscular wall that draws in food

Seminal receptacles

Structure that stores sperm

Aortic Arches

Helps distribute blood to the head and upper extremities

Esophagus

Lies below the heart; Moves food from the pharynx to the crop

Sperm duct

Transport sperm from the male pores to the seminal vesicles of the other worm

Calciferous glands

Excretion

Crop

Stores food for a short time

Gizzard

Grind up food and begin the digestion process

Intestine

Breaks down food and sends nutrients into bloodstream

Dorsal blood vessel

Pumps blood from the posterior to the anterior

Subpharyngeal ganglion

Controls 2nd, 3rd, and 4th segment of Earthworm’s body

Nerve cord

Allow earthworm to respond to light,touch,vibrations, etc

Testis

Store sperm

Sperm funnel

Transports sperm

Seminal vesicles

Reproductive organs that mature sperm and nourish it

Ovary

Produce eggs

Oviduct

Transport eggs from the ovaries to outside the body

Nephridium

Remove waste and maintain salt + water balance

Nephridiopore

Expel nitreous waste from the body

Nephrostome

Removal of waste from body cavity

Bladder

Stores waste before release

Ciliated tube

Filter fluid from the body cavity and carry waste

Septum

Holding segments in place

Clitellum

Reproduction + Regeneration

Egg sac

To contain and protect eggs

Slime tube

Facilitate the exchange of sperm