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.
Cane Spiders and Humans. Cane spiders are nocturnal, entering homes and hiding behind wall hangings and under furniture, coming out at night to hunt. They are found in cars, often behind sun visors, frightening humans with their large size. Cane spiders are reluctant biters, biting only if provoked.