Neuromelanin
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Neuromelanin is a dark pigment found in the brain which is structurally related to melanin. It is a polymer of 5,6-dihydroxyindole monomers. Neuromelanin is found in large quantities in catecholaminer
Photomicrograph of neuromelanin (brown material) in a neuron of the substantia nigra. Hematoxylin and eosin stain. The scale bar is 20 microns (0.02mm) in length.
Locus coeruleus
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The locus coeruleus, also spelled locus caeruleus or locus ceruleus, is a nucleus in the pons of the brainstem involved with physiological responses to stress and panic. It is a part of the reticular
Neuromelanin
…polymer of 5,6-dihydroxyindole monomers. Neuromelanin is found in large quantities in catecholaminergic cells of the substantia nigra pars compacta and locus coeruleus, giving a dark color to the structures. Neuromelanin gives specific brain sections, such as the substantia nigra or the locus coeruleus, distinct color…
Micrograph showing the locus coeruleus (upper-right of image) in an axial section of the pons. The fourth ventricle (quasi-triangular white area) is in the upper-left of the image. The midline is seen on the left. The large white area in the upper-left corner is where the cerebellum would be. HE-LFB stain.
Locus coeruleus highlighted in green.
Micrograph showing the locus coeruleus. HE-LFB stain