Melasma Causes. Melasma is usually caused by the sun, hormones in birth control pills, hormone replacement therapy, medications and pregnancy. When Melasma is caused by pregnancy it is called chloasma. In some women, when the skin is exposed to sunlight, brown blotches of excess pigment form due to the interaction with hormones or chemicals. Melasma is believed to be hereditary and woman with darker skin tones tend to be more at risk for this disorder.
Some research suggests that the hippocampus may participate only in consolidation processes lasting a few years. The entorhinal cortex, on the other hand, gives evidence of temporally graded changes extending up to 20 years, suggesting that it is this region that participates in memory consolidation over decades. The entorhinal cortex is damaged in the early stages of Alzheimerâs disease.
The striatum of the brain, also called the striate nucleus or striate body, is involved in a number of different cognitive processes.This portion of the brain is called the striatum because its structural organization is such that it appears to be striped with layers of gray and white matter.he striate nucleus is part of the cerebrum of the brain, which is also called the forebrain due to its frontal location. The striatum comprises three separate structures: the caudate nucleus; the putamen; and the fundus, which links the caudate nucleus and putamen together.