Human races

 

Human beings belong to the genus Homo and modern humans belong to the species sapiens and subspecies sapiens (Homo sapiens sapiens). They represent the most sophisticated creatures of life. Human races tend to be classified based on color of skin and they include

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Caucasoid race (white)

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Negroid  race (black)

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Australoid (Australian aboriginal)

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Mongoloid race (Asiatic)

The color of the skin is determined by the following factors

Skin color in humans is caused by five pigments in the skin mostly at the level of superficial epidermis as follows

 

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Melanin (brown) found in stratum germinativum of epidermis. It is present in the dermis of monkeys and apes.

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Melanoid (brown) is found in stratum germinativum of epidermis.

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Carotene (yellow to orange) is found in stratum corneum which is most superficial layer.

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Hemoglobin (purple) is found in superficial blood vessels of skin.

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Oxyhaemoglobin (red) is found in superficial blood vessels of skin.

The amount of the above substances present in the epidermis of the skin will determine the color which the skin adopts. Hence black people tend to have more melanin (and of course melanoid) which is produced by melanocytes in the skin. White people have the least of melanin in the epidermis of skin. But all have the same number of melanocytes in skin.

 

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Skin explanatory video

 

 

 

Cell biology
Histology
Embryology
Gross anatomy
Lymphatic drainage
Organ integration
Clinical anatomy

Quiz

Physiology

Biochemistry

Chemical Pathology

Pharmacology

Anatomical Pathology

Imaging

Medicine

Surgery

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