Only after examining their internal anatomy by specialized staining
procedures can one appreciate how unusual they are (Fig.
4). In the head, for example, the brain and the three
paired, primary sense organs-the eyes, the (inner) ears,
and the nose (olfactory organ)-predominate at the
expense of the bony skull, which is reduced in many
places to little more than thin scaffolding
Only after examining their internal anatomy by specialized staining
procedures can one appreciate how unusual they are (Fig.
4). In the head, for example, the brain and the three
paired, primary sense organs-the eyes, the (inner) ears,
and the nose (olfactory organ)-predominate at the
expense of the bony skull, which is reduced in many
places to little more than thin scaffolding
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