Question: What Are Exogenous Pigments?

What is melanin in the skin?

Melanin is a natural skin pigment.

Hair, skin, and eye color in people and animals mostly depends on the type and amount of melanin they have.

Special skin cells called melanocytes make melanin.

Everyone has the same number of melanocytes, but some people make more melanin than others..

What is an artifact in histology?

An artifact is defined as any structure or feature in the histological section, which is not normally present in the normal tissue, and it may come from outside sources. Some artifact are easily distinguished and some are not .when it is present it may confuse with normal tissue or any pathological changes.

What is lipofuscin pigment?

Abstract. Lipofuscin (age pigment) is a brown-yellow, electron-dense, autofluorescent material that accumulates progressively over time in lysosomes of postmitotic cells, such as neurons and cardiac myocytes.

How Hemosiderin is formed?

When red blood cells break down, the hemoglobin releases iron. The trapped iron is then stored as hemosiderin in tissues beneath your skin, causing visible hemosiderin staining.

What is pigment in histopathology?

= substances having own color. – soluble. – corpuscular (granules, crystals…) – responsible for pigmentation of tissues/organs.

Why lipofuscin is called the wear and tear pigment?

Lipofuscin is sometimes called “wear-and-tear pigment”, since the amount increases over time (i.e., with advancing age) in cells like hepatocytes and neurons which are both permanent (not routinely replenished) and metabolically active. … They often appear paired, since hepatocytes are commonly binucleate.

What different types of pigments are commonly seen in histology?

Other pigments encountered in histological sections are hematoidin (Bright yellow), hemosiderin (light brown), melanin (dark brown) among others.

What are endogenous pigments?

Endogenous Pigments. Endogenous pigments are characterized as hematogenous and nonhematogenous. Hematogenous pigments originate from blood and nonhematogenous pigments originate from non-blood, fat or fatlike, and non-fatlike substances.

Is melanin an exogenous pigment?

Exogenous pigments: pigments or minerals having an origin outside the tissue but which are not related to the preparation thereof. Endogenous pigments: pigments formed in the body. We distinguish between hematogenous pigments such as bile and non-haematogenic pigments such as melanin, lipofuschine, etc.