Sauter vers contenu principal Sauter vers case de recherche

Definition: dwarfism from Merriam-Webster's Collegiate(R) Dictionary

(1865) : the condition of stunted growth

Summary Article: dwarfism
From The Columbia Encyclopedia

condition in which an animal or plant is less than normal in size and lacks the capacity for normal growth. Dwarfism is deliberately produced and perpetuated in certain species (e.g., in breeding miniature dogs and cultivating dwarf plants). Among humans, dwarfism usually results from a combination of genetic factors and endocrine malfunction. It can also be caused, however, by acquired conditions, such as kidney disease. Pituitary dwarfism is caused by an insufficiency of the pituitary growth hormone (hypopituitary dwarfism). Typically, the pituitary dwarf stops growing in early childhood but retains normal body proportion, mental capacity, and sexual development. Pharmaceutical companies are cloning human growth hormone to stimulate growth in children afflicted with hypopituitary glands. This type of dwarf, who is completely normal except for size, is commonly called a midget. Cretinism is a type of dwarfism accompanied by mental retardation and distortion of the body, resulting from an insufficiency of thyroid hormone. Unlike cretinism and pituitary dwarfism (which are thought to be caused by a combination of heredity and endocrine malfunction), achondroplastic dwarfism is the result of a completely hereditary, dominant genetic trait. Typically, the growth of the limbs is stunted, but the size of the trunk and mental capacity are normal. Humans who range in height from 2 to 4 ft (5.08–10.16 cm) are generally classified as dwarfs. However, small size that is an inherited characteristic of race (such as among African Pygmies) is not considered to be dwarfism since the individuals in such groups are physiologically normal.

The Columbia Encyclopedia, © Columbia University Press 2018

Articles reliés dans Credo

Full text Article dwarfism
The Macmillan Encyclopedia

Abnormal smallness. The commonest cause is lack of food, and growth can be accelerated if enough food is given. Dwarfism can also occur in...

Full text Article DWARFISM
Encyclopedia of Disability

Dwarfism is a rare phenomenon that nevertheless seems to have occurred in every recorded human society, as evidenced by images and records from...

Full text Article hypophysial dwarf
Stedman's Medical Dictionary

dwarfism as result of failure of growth hormone production because of hypothalamic or pituitary abnormality. pituitary dwarf

Voir plus dans Credo