Dematology
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Dermatology
Skin Structure and Functions
UPACE, Open U ARTS4003BP
I Skin Structure
• Epidermis The epidermis is the outermost layer of the skin. It forms the protective covering of the skin of the body, It contains no blood vessels, but has many small nerve endings. The epidermis contains the following layers: Stratum Corneum, Stratum Lucidum, Stratum Granulosum , Stratum Spinosum and Stratum Germinativum. Dermis Dermis is the underlying, or inner layer of the skin, It is highly senSitive and vascular layer of connective tissue. Within it's structure are found numerous blood vessels, lymph, nerves, sweat gland, oil gland, hair follicles, arrector pilli muscles and papillae, The dermis consists of two layers: the papillary or superficial layer, and the reticular or deeper layer. Subcutaneous Fa~ Tissue (Hypodermis) Subcutaneous Tissue is a fattY layer found beow the dermiS. Some histologists consider this tissue as a continuation of the dermis.
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I Epidermis
• The stratum corneum: consists of tightly packed, scale-like cells, which are continually being shed and replaced. • The stratum lucidum: consists of small, transparent cells through which light can pass. It is only present on the palms of the hands and soles of the feet where the epidermis is the thickest. It is not present where there are hair follicles.
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I Epidermis
• The stratum granulosum: consists of cells that look like distinct granules. These cells are dying and undergo a change into a hard substance. • The stratum spinosum: is often classified with the stratum germinativum, to form the basal layer. As the cells undergo mitosis from below, they are pushed upward into the stratum spinosum . • The stratum germinativum: is composed of a singke layers of cells and is the lowest layer of cells that make up the living stratum or basal layer. It is in this layer that the cells divide and begin their journey to the surface , to replace older cells that are being
Dermatology
Skin Structure and Functions
UPACE, Open U ARTS4003BP
I Skin Structure
• Epidermis The epidermis is the outermost layer of the skin. It forms the protective covering of the skin of the body, It contains no blood vessels, but has many small nerve endings. The epidermis contains the following layers: Stratum Corneum, Stratum Lucidum, Stratum Granulosum , Stratum Spinosum and Stratum Germinativum. Dermis Dermis is the underlying, or inner layer of the skin, It is highly senSitive and vascular layer of connective tissue. Within it's structure are found numerous blood vessels, lymph, nerves, sweat gland, oil gland, hair follicles, arrector pilli muscles and papillae, The dermis consists of two layers: the papillary or superficial layer, and the reticular or deeper layer. Subcutaneous Fa~ Tissue (Hypodermis) Subcutaneous Tissue is a fattY layer found beow the dermiS. Some histologists consider this tissue as a continuation of the dermis.
•
•
1
I Epidermis
• The stratum corneum: consists of tightly packed, scale-like cells, which are continually being shed and replaced. • The stratum lucidum: consists of small, transparent cells through which light can pass. It is only present on the palms of the hands and soles of the feet where the epidermis is the thickest. It is not present where there are hair follicles.
0
'.
I Epidermis
• The stratum granulosum: consists of cells that look like distinct granules. These cells are dying and undergo a change into a hard substance. • The stratum spinosum: is often classified with the stratum germinativum, to form the basal layer. As the cells undergo mitosis from below, they are pushed upward into the stratum spinosum . • The stratum germinativum: is composed of a singke layers of cells and is the lowest layer of cells that make up the living stratum or basal layer. It is in this layer that the cells divide and begin their journey to the surface , to replace older cells that are being