If well fed, the ectomorph did not gain weight easily if ectomorphs became fat, they were still considered ectomorphs, only overweight. Ectomorph: Thin and fine-boned body type with thoughtful, introverted, and sensitive personality traits. Named for the mesoderm, the middle layer forming the muscle and bones of a developing embryo. The extreme ectomorph had a thin face with a high forehead and a receding chin a narrow chest and abdomen a narrow heart rather long, thin arms and legs little body fat and little muscle but a large skin surface and a large nervous system. Mesomorph: Square and muscular body type with dynamic, assertive, and aggressive personality traits. The classification numbers were negatively correlated, so that a high number in one class precluded high numbers in the others in practice, extreme types (711, 171, 117) were rare or nonexistent, and the person of normal build had a somatotype approaching 444, evenly balanced between extremes.Īlthough classification by the Sheldon system was not absolute, a person was classed as an ectomorph if ectomorphy predominated over endomorphy and mesomorphy in his or her body build. Hence, the extreme endomorph had the somatotype 711, the extreme mesomorph 171, and the extreme ectomorph 117. A somatotype number of three digits was determined for an individual classified by the system, with the first digit referring to endomorphy, the second to mesomorphy, and the third to ectomorphy each digit was on a scale of 1 to 7. In Sheldon’s system humans were classified as to body build in terms of three extreme body types: endomorphic, or round, fat type mesomorphic, or muscular type and ectomorphic, or slim, linear type. Sheldon linked ectomorphy to certain character traits, an idea that today is considered pseudoscience, unsupported by scientific evidence. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Įctomorph, a human somatotype (physical type) tending toward linearity, as determined by the since discredited physique-classification system developed in the 1940s by American psychologist W.H.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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