Atlas of Animal Anatomy and Histology
Molluscs (Mollusca)
Roman snail (Helix pomatia)
Head of a living Roman snail
Head region of snail
Openings of the snail are situated on the right side
Histological sections of the edge of the mantle
Snail with shell partly removed
Snail after removal of the shell
The first cut of the dissection, as indicated by the dashed line under the edge of mantle
The second cut follows the rectum to the highest level of the pulmonary chamber
The second cut continues on the wall of the visceral mass
Organs of the snail after the first two cuts
The line of the third cut
The line of the third cut runs to the mouth
Snail’s organs in the mantle wall
Organs in the mantle wall of the snail (vessels and heart filled with toluidine blue stain)
Histological sections of the lung (HE)
Histological sections of the lung (semi-thin section, toluidine blue staining)
Dissection of the gonads
The reproductive organs of the Roman snail
Cut dart sac with love-dart in place
The isolated love-dart is only about half a centimetre long
Histological section of the hermaphrodite gland (HE)
Completely dissected snail in water cover
Dissected head region of the snail
Radula of the Roman snail displayed after opening the dorsal side of the buccal cavity
The thin chitinous layer of the radula under light microscope
The circum-oesophageal nerve ring with emerging nerves
Histological sections of both cerebral ganglia of the Roman snail (HE)
Histological sections of the eye of the Roman snail in a withdrawn tentacle in two different planes (HE)
Lateral view of a freshwater mussel (Anodonta anatina)
Inner surface of right valve of a mussel’s shell with the iridescent hypostracum layer
Semi-transparent mantle of the mussel and organs which show through it after opening the shell
The mantle folded up to expose the right pair of gills and body mass beneath
The free part of the right mantle (lifted) and organs of the mantle cavity
The right mantle removed, right pair of gills folded up to expose more of organs of the mantle cavity
Closer view of the right pair of gills
Transverse cross section through a portion of the gill of a mussel (HE)
The epibranchial canal is found dorsally to the gills leading to the exhalant siphon
The right pair of labial palps leading food into the slit-like mouth of the mussel
The right pair of labial palps is a flap-like, ciliated structure and guides food particles toward the mouth
The completely dissected mussel
The anterior part of the alimentary canal and surrounding organs
The oesophagus and the stomach of the mussel
A close up of the rippled ciliated surface of the stomach
The position of the anus (probe in the end part of the rectum)
The heart and surrounding organs.
The heart and the two aortae after injection of toluidine blue solution
The cerebral ganglion
Visceral ganglia against the ventral side of the posterior adductor muscle