Tortora, Gerald J., and Bryan Derrickson. Principles of Anatomy and Physiology. 12th ed. United States of America: John Wiley and Sons, Inc, 2009. Print. “Dwarfism.” <http://kidshealth.org/Search01.jsp> Nov. 24, 2009. Kugler, Mary. “How many types of dwarfism are there?” <http://rarediseases.about.com/od/dwarfism/f/dwarfismtypes.htm> Nov. 24, 2009.
Have you ever been somewhere and seen a person who is shorter than the average person, but appear to look older? More than likely they have a condition known as, “Dwarfism.” They usually have a normal size body with the exception of their arms and legs. Most dwarfs are less than 4 feet 10 inches and need help reaching higher objects. Dwarfism is a condition of seized growth and is characterized by shortness. Some people can be identified before birth if they have dwarfism by doing a sonogram, but unfortunately most are identified after they are born.
Dwarfism can be caused by more than 200 conditions, however, most are caused by genetics. Genetic mutations in the egg or sperm cells prior to conception have been known as a cause of dwarfism. It can be caused by genes from one or both parents. Other causes of small people are excessive or not enough hormones that control how tall we grow. Dwarfism can and most often happens in families where both parents are of normal height. It has also been lead to believe chromosomal abnormalities, pituitary diseases, and kidney diseases can all lead to people being a dwarf. There are over 200 types of dwarfism. However, there are two main types. Disproportionate dwarfism is one main type. A person with this type of dwarfism has some average body parts and some shorter body parts. The shorter body parts are usually their limbs (arms and legs). The most common type of disproportionate dwarfism is achondroplasia, which has an average height of 4 feet and occurs in 1 of every 26,000 –...