Located of the brainstem; controls breathing and heartbeat; connects the medulla to the two sides of the cerebellum to help coordinate and integrate movement on each side of side of the body; involved in sleep and dreaming.
Serious symptoms related to the bite of a brown recluse spider include low platelet count, destruction of the red blood cells, blot clots in capillaries, inability to form clots, acute renal failure or kidney damage, coma, and death.
Both of which are localized skin infections/inflammations. A spider bite could occur on back but is less likely. A spider bite could get infected or it could cause tissue necrosis as with the brown recluse spider bites. became quite ill from it. Luckily, most people do not have this severe a reaction. Brown recluse bites can cause minor reactions or they can in rare cases be deadly. Hemotoxic venom is injected when they bite. In one study, over a third of bites led to necrosis (destruction) of the skin surrounding it.