Form and Function

Structure	Location
Circulatory System
dorsal blood vessel	length of body above intestine
subneural blood vessel	length of body below intestine
hearts	segments 6-10
ventral blood vessel	length of body below intestine
Digestive / Excretory System
nephridium	pair in each segment
intestine	from segment 19 or 20 to end of body
lumen of intestine	inside of intestine
typhlosole	inside central folds on intestine
chloragogue cells	surrounding outside of intestine
mouth	at the very end of the anterior
pharynx	segment 3
pharyngeal muscles	on either side of pharynx in segment 3
esophogus	segments 4-12
crop	segments 13-14
gizzard	segments 15-18
Nervous System
ventral nerve cord	length of body below intestine
brain	segment 2 above pharynx
Reproductive System
oviduct	segments 12-13, pair
ovary	segment 12, pair
seminal receptacles	segments 8-9, two pairs
seminal vesicles	segments 8-11, large, two on either side of esophogus
testes	by seminal vesicles
ductus deferens	by seminal vesicles
Muscular System
circular muscles	length of body, outside of longitudinal muscles
longitudinal muscles	length of body, inside of circular muscles
setae	each segment except first and last one
Other Structures
epidermis	outside of entire body
peritoneum	between each segment
coelom	(describes entire worm structure)