Marchi stain

Mar·chi stain

(mahr'kē),
a staining method by which the specimen is hardened for 8-10 days in a modified Müller fixative, followed by immersion for 1-3 weeks in the same with the addition of osmic acid; fat and degenerating nerve fibers stain black.

Mar·chi stain

(mahr'kē stān)
A staining method in which the specimen is hardened for 8-10 days in a modified Müller fixative, followed by immersion for 1-3 weeks in the same with the addition of osmic acid; fat and degenerating nerve fibers stain black.

Marchi,

Vittorio, Italian physician, 1851-1908.
Marchi fixative - used to demonstrate degenerating myelin.
Marchi reaction - failure of the myelin sheath of a nerve to blacken when submitted to the action of osmic acid.
Marchi stain - a method for demonstrating fat and degenerating nerve fibers.
Marchi tract - a bundle of thick, heavily myelinated fibers originating in the deep layers of the superior colliculus. Synonym(s): tectospinal tract