Polymelia
Polymelia (pronunciation: /pɒlɪˈmiːliə/) is a birth defect involving limbs (a type of dysmelia), in which the affected individual has more than the usual number of limbs. This condition is also known as hydra syndrome.
Etymology
The term "polymelia" comes from the Greek words "poly" meaning "many", and "melia" meaning "limb".
Causes
Polymelia is usually caused by the improper division of the embryo during the early stages of development. This can result in the formation of additional limbs, which are often smaller and less functional than the normal limbs. Other causes can include exposure to certain drugs or chemicals during pregnancy, or genetic factors.
Types
There are several types of polymelia, including:
- Dipus: This is the presence of two extra limbs, usually legs.
- Tripus: This is the presence of three extra limbs.
- Quadripus: This is the presence of four extra limbs.
Treatment
Treatment for polymelia usually involves surgical removal of the extra limbs. In some cases, physical therapy may also be needed to help the individual learn to use their remaining limbs effectively.
Related Terms
- Dysmelia: A broader term for a variety of limb malformations.
- Amelia: A condition in which one or more limbs are completely absent.
- Meromelia: A condition in which a part of a limb is missing.
External links
- Medical encyclopedia article on Polymelia
- Wikipedia's article - Polymelia
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