Structure of Skin

Skin is the largest organ of the body. It protects us from microbes, helps to regulate body temperature and permits the sensations of touch, heat, and cold.

Skin is made of two layers, dermis and epidermis.

Epidermis is the outer thinner part that is made up of three layers namely, stratum corneum, stratum granulosa and germinative layer.

Stratum corneum is the top layer of the skin made up of flattened dead cells.

Thin middlestratum granulosa is composed of two to three layers of flattened cells.

The cells of the innermost germinative layer are capable of rapid mitotic divisions.

The special cells found in skin are keratinocytes, melanocytes, Merkel cells, Langerhans’ cells etc.

Dermis is the inner and thicker part of skin,made up of connective tissue containing elastic fibres.

The two sub-layers of dermis are stratum papillare and stratum reticulare.

Dermiscontains blood vessels, nerve fibres, sensory organs, sweat glands and hair follicles.

Hypodermis lies below the dermis and contains adipose tissue. It serves to attach the dermis to its underlying tissues.

The Complexion of skin is due to pigment melanin contained in the cells of the germinative layeror malpighian layer.

Abnormal conditions of skin pigmentation include leucoderma, albinism and freckles.

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  • Q1

    Name the site of deposition of colour pigment in the skin.

    Marks:1
    Answer:

    The colour pigments in the skin are deposited in the Stratum Germinativum (Malpighian layer) of the epidermis.

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  • Q2

    Name the pigment that imparts colour to the skin.

    Marks:1
    Answer:

    Melanin is the pigment which gives colour to the skin.

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  • Q3

    Name the layer of epidermis which shows high mitotic activity.

    Marks:1
    Answer:

    Stratum Germinativum (Malpighian layer) is the layer of epidermis which shows high mitotic activity.

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  • Q4

    Name the type of tissue that constitutes the dermis.

    Marks:1
    Answer:

    Connective tissue is the type of tissue that constitutes dermis.

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  • Q5

    Name the type of tissue that constitutes the epidermis.

    Marks:1
    Answer:

    The epithelial tissue is the type of tissue that constitutes the epidermis.

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