A substance, such as pollen, that causes an allergy. - Though allergens are not harmful themselves, when they are combined with certain antibodies, a reaction (i.e. the allergy) liberates substances that damage body cells and tissues.. A substance, such as pollen, that causes an allergy. [German. : , allergy; see allergy +. , -gen (from French. ; see-gen).]. alâ²lerÂ·genâ²ic (-jÄnâ²Ä­k) adj.
A Honor Society of Nursing (STTI) answered. Prognosis varies depending on the type of motor neuron disease (MND) and the age of onset. Some MNDs, such as Post-polio syndrome (PLS), are not fatal and progress slowly.People with Spinal muscular atrophy (SMA) may appear to be stable for long periods, but improvement should not be expected.ome MNDs, such as Post-polio syndrome (PLS), are not fatal and progress slowly. People with Spinal muscular atrophy (SMA) may appear to be stable for long periods, but improvement should not be expected.
Motor Neurone Disease (MND) is the name given to a group of closely related disorders affecting the motor neurones (nerve cells controlling muscles) in the brain and spinal cord. Degeneration of these motor neurones results in progressive muscle wasting and weakness because the muscles have lost their nerve supply.ecause MND is a progressive disease, the muscular weakness becomes worse with time. The patient may eventually require a wheelchair because of leg and trunk weakness, and become generally immobile. At some stage in the disease the patient will suffer from âbulbarâ symptoms.