Earthworm, transverse section

Earthworm, transverse section

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Earthworm. Light micrograph of a transverse section through the body of a round segmented earthworm (Lumbricus terrestris) in the intestinal region. The intestine (circular, centre) includes the typhlosole (upper centre). In the body cavity (white) are the excretory organs, the nephridia (kidney-like organs, pink, right and left), and the nerve cord (pink, lower centre). The outer ring (pink) consists of the epidermis, circular muscles, and longitudinal muscle (radiating lines). The gaps in the outer ring are bristles (chaetae) that help the movement of earthworms in their burrows. Magnification: x14 when printed at 10 centimetres across.

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Keywords: anatomical, anatomy, animal, annelid worm, annelida, biological, biology, bristle, bristles, chaeta, chaetae, circular muscles, cross-section, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, earthworm, epidermis, fauna, gut, histological, histology, intestinal, intestine, invertebrate, invertebrates, light micrograph, light microscope, lm, longitudinal muscle, lumbricus terrestris, nature, nephridia, nephridium, nerve cord, round segmented earthworm, section, sectioned, transverse, typhlosole, wildlife, worm, zoological, zoology

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