Questions and Answers
What is the thickness of the epidermis on most of our body?
0.08 mm
Which layer of the epidermis is responsible for cells dying and being replaced by keratin?
Stratum granulosum
The Stratum lucidum is only found on the ______, appearing as a clear, glassy layer under the microscope.
palms of the hands and soles of the feet
What is the thickness of the epidermis on most of our body?
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Which layer of the epidermis consists of cells that have begun making keratin and have started to flatten?
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The Stratum lucidum layer is present only on the palms of the hands and soles of the feet.
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Study Notes
Structure of the Epidermis
- The epidermis is the skin's outer layer, a tough protective covering that varies in thickness.
- On most of the body, the epidermis is only about 0.08 mm thick.
Layers of the Epidermis
- Stratum Basale: The innermost layer, containing basal cells that are constantly rejuvenated after old cells are shed.
- Stratum Spinosum: Lies above the stratum basale, featuring many layers of cells with centrally located, large, oval nuclei and spine-like cell membrane extensions.
- Stratum Granulosum: Consists of cells that have begun making keratin, started to flatten, and die, with cytoplasm replaced by keratin.
- Stratum Lucidum: A clear, glassy layer found only on the palms of the hands and soles of the feet, visible under a microscope.
- Stratum Corneum: The outermost layer, visible to the unaided eye, comprising 15-30 layers of flat, dead cells filled with keratin, constantly being shed and replaced, leading to callous build-up from friction or pressure.
Structure of the Epidermis
- The epidermis is the skin's outer layer, a tough protective covering that varies in thickness.
- On most of the body, the epidermis is only about 0.08 mm thick.
Layers of the Epidermis
- Stratum Basale: The innermost layer, containing basal cells that are constantly rejuvenated after old cells are shed.
- Stratum Spinosum: Lies above the stratum basale, featuring many layers of cells with centrally located, large, oval nuclei and spine-like cell membrane extensions.
- Stratum Granulosum: Consists of cells that have begun making keratin, started to flatten, and die, with cytoplasm replaced by keratin.
- Stratum Lucidum: A clear, glassy layer found only on the palms of the hands and soles of the feet, visible under a microscope.
- Stratum Corneum: The outermost layer, visible to the unaided eye, comprising 15-30 layers of flat, dead cells filled with keratin, constantly being shed and replaced, leading to callous build-up from friction or pressure.
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Description
Learn about the epidermis, the outer layer of the skin, and its structure, including the stratum basale and stratum spinosum.
