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has more neurons than a slug, but a chimp has more neurons than a mouse. One can assume that part of this comes from having to adapt to an increase in the size of the species. Also, in some species, the rhombomeres are obviously segmented and stay this way for an extended period of time. In other species, the segmentation eventually disappears. For example, rhombomeres are detectable by light microscopy in Swiss/Webster strain of mice for up to embryonic day (E)10.5, but they disappear at E11.5. Many rhombomeres, if compared across species,

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