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front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |review |
 A: constriction of visial field, B: impairment of hearing, C: disturbance of sensation, D: ataxia, E: extrapyramidal symptoms, F: exaggerated tendon reflex, F: weak tendon refex, H: pathological reflexes, I: slight mental disturbance (Data from Tsubaki, 1965) |
Methylmercury poisoning exhibits a variety of neuropathological features from severe changes at the early stage to mild changes. In the adult and infant type, predilection sites of the changes are clear; calcarine, post-central, pre-central, and superior temporal cortices are most vulnerable, whereas the changes in the brains of fetal type are less-localized, and show hypoplasia or developmental arrest, rather than neuronal destruction. |