Medical Definition of ARTHRODESIS. : the surgical immobilization of a joint so that the bones grow solidly together: artificial ankylosis. the surgical immobilization of a joint so that the bones grow solidly together. ADVERTISEMENT.
Trapdoor spiders are not particularly harmful to man however, like Tarantulas, the tiny hairs on the legs of some species leave tiny red marks where the toothed hairs on the spiders' feet have clung to the skin. Mouse spiders are also a type of Trapdoor spider with huge chelicerae and may measure up to 35mm in body length.
(Before It's News) There are many dangerous spiders but the most dangerous 10 spiders out of these have been listed. These spiders cannot only poison the small mammals but also affect the humans by making them very ill. Most of the time a bite by these spiders results in some kind of headache or illness or vomiting.