Artificial organ a stationary power supply or other stationary resources such as filters or chemical processing units. (Periodic rapid recharging of batteries, refilling of chemicals, and/or cleaning/replacing of filters would exclude a device from being called an artificial organ.) Thus, a dialysis machine, while a very successful and critically important life support device that almost completely replaces the duties of a kidney, is not an artificial organ. Constructing and installing artificial organs, an extremely research-intensive and expensive process initially, may entail many years of ongoing maintenance services not needed by a natural organ.: The use of any artificial organ by humans is
Transneuronal degeneration neurons is not present after upper motor neuron lesions in stroke patients. In addition cortico spinal tract lesions do not cause anterograde transneuronal degeneration of spinal anterior horn cells. Disconnection syndromes, defined as any neurologic disorder caused by an interruption in impulse transmission along cerebral fiber pathways, can cause white matter brain lesions, leading to secondary neuronal loss and transneuronal degeneration. Secondary neuronal loss occurs as a result in areas that are strongly connected with the severed tracts or restricted cortex during an anterior temporal lobectomy. Temporal lobe lesions also cause transneuronal degeneration, the effects of which can be seen