Earth Worm Vocab (External & Internal Features) Flashcards

Digestive System
Terms Definitions
prostomium
small projection hanging over mouth
setae
bristle like structures that help worm burrow in soil
cuticle
non-living, non-cellular thin layer on outer surface of body secreted by the epidermis
clitellum
synthesizes a reproductive cocoon of mucus
dorsal blood vessel
main transport channel of blood
gizzard
breaks down soil and leaf litter
crop
stores and partially digests food
esophagus
part of the alimentary canal between pharynx and crop, on either side are the calciferous glands which control ion balance
seminal vesicles
"male" part of reproductive system; produces and stores sperm until it is needed during copulation
1st aortic arch
pumps blood around the body
Pharynx
muscular portion of alimentary canal and sucks food or soil into the mouth
cerebral ganglia (brain)
rudimentary brain
buccal canal
cavity between mouth and pharynx
mouth
entrance to digestive system
longitudinal muscles
cause segment to shrink; peristaltic movement
circular muscles
cause segment to elongate; peristlatic movement
seminal receptacle
"female" part of reproductive system; recieves sperm
testes
site of sperm production
sperm funnel
channel in which sperm travel from testes to vas deferens
ovary
site of oogenesis
egg funnel and oviduct
channels through which eggs travel from ovary to genital pore
ventral nerve cord
transports electrical impulses between the cerebral ganglion down the length of body
ventral blood vessel
smaller blood vessel
nephridium
in charge of excretory waste
dorsal
upper surface
anterior
head region
ventral
under surface
posterior
tail region
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