dissection of a preserved earthworm shows some of the more conspicuous
features of its internal anatomy. Digestive structures that can be seen
include the buccal cavity (1), pharynx (2), crop (3) and gizzard (4). Also
seen on the image are the seminal vesicles (6), seminal receptacles (7),
the dorsal blood vessel (5) that runs along the top of the intestine,
two of the many septa (8) that divide the coelom into separate segments
called metameres and one of the five pairs of aortic arches (9) that help
pump blood from the dorsal blood vessel to the ventral blood vessel.