Word: ectoderm
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...Sheldon describes and defines his three components. They are called endomorphic, mesomorphic and ectomorphic because the prominent features of each are derived, respectively, from the embryo's endoderm or inner layer (abdominal organs), the mesoderm or middle layer (bones, muscles, connective tissue, heart, blood vessels), and the ectoderm or outer layer (skin, hair, nails, sense organs, nervous system, brain...
...memory of Thomas Henry Huxley (1825-95), who is probably better known to the average U.S. undergraduate today as a character in a ribald polysyllabic ditty beginning: Recent exhaustive researches By Darwin and Huxley and Hall . . . than as the biologist who first generalized upon the development of ectoderm and endoderm, who "freed British scientific thought from its vice of deductive reasoning," who interpreted, clarified, broadened the Darwinian evolutionary hypothesis...
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