Oncosphere
Oncosphere
The Oncosphere (pronunciation: /ɒnˈkɒsfɪər/), also known as the hexacanth (pronunciation: /ˈhɛksəˌkænθ/), is the first larval stage of certain tapeworms in the family Taeniidae. The term "oncosphere" is derived from the Greek words "onkos" (meaning mass or bulk) and "sphaira" (meaning sphere), referring to the spherical shape of the larva.
Description
The oncosphere is a microscopic larval stage that is covered by a thick, radially striated shell. It contains six embryonic hooks, hence the alternative name hexacanth. These hooks are used to penetrate the intestinal wall of the intermediate host, where the oncosphere develops into a metacestode.
Life Cycle
The life cycle of the oncosphere begins when the eggs of the tapeworm are ingested by an intermediate host, typically a herbivorous or omnivorous animal. Once inside the host's intestine, the oncosphere hatches from the egg, uses its hooks to penetrate the intestinal wall, and then travels to various organs or tissues where it develops into a metacestode.
Related Terms
- Tapeworm: A parasitic flatworm, the adult of which inhabits the intestine of various vertebrates, including humans.
- Metacestode: The second larval stage of certain tapeworms, which develops from the oncosphere.
- Hexacanth: Another term for the oncosphere, referring to the six hooks it possesses.
- Taeniidae: A family of tapeworms that includes some species which have an oncosphere stage.
External links
- Medical encyclopedia article on Oncosphere
- Wikipedia's article - Oncosphere
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