Diagrammatic transverse view of the buccal cavity of a gastropod, showing the radula and how it is used.
The rest of the body of the snail is shown in green. The food is shown in blue. Muscles that control the radula are shown in brown. The surface of the radula ribbon, with numerous teeth, is shown as a zig-zag line.
(e = esophagus, m = mouth, mx = maxilla, o = odontophore, op = odontophore, protractur muscle, r = radula, rp = radula protractor muscle, rr = radula retractor muscle)
(via: Wikipedia)
(via rhamphotheca)
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