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What stratum is the pointer pointing to?

What stratum is the pointer pointing to?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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The image shows a detailed anatomical model of human skin layers. The pointer is directed towards the outermost layer labeled as the "Stratum Corneum." ### Explanation of the Diagram: 1. **Stratum Corneum (a)**: This is the outermost layer of the epidermis, composed mainly of dead keratinized cells that protect underlying tissues and prevent water loss. 2. **Epidermis**: The thin, outer layer of skin primarily involved in protection, which includes several strata: - **Stratum Basale (e)**: The deepest epidermal layer where cell division occurs. - **Stratum Spinosum (d), Stratum Granulosum, and Stratum Lucidum**: Intermediate layers involved in the process of keratinization. 3. **Dermis (b)**: The middle skin layer containing connective tissue, blood vessels, nerve endings, sebaceous glands (f), and sweat glands. 4. **Hair Follicle & Shaft**: The model shows a hair shaft extending from the follicle, running through the dermis. 5. **Subcutaneous Tissue**: This is the deepest layer comprising mainly fat tissues that provide insulation and cushioning. 6. **Blood Vessels and Nerves**: Visible as red and yellow strands, they are crucial for nutrient delivery and sensation. This educational model helps students visualize and understand the intricate structure and function of the skin's layers.
Transcribed Image Text:The image shows a detailed anatomical model of human skin layers. The pointer is directed towards the outermost layer labeled as the "Stratum Corneum." ### Explanation of the Diagram: 1. **Stratum Corneum (a)**: This is the outermost layer of the epidermis, composed mainly of dead keratinized cells that protect underlying tissues and prevent water loss. 2. **Epidermis**: The thin, outer layer of skin primarily involved in protection, which includes several strata: - **Stratum Basale (e)**: The deepest epidermal layer where cell division occurs. - **Stratum Spinosum (d), Stratum Granulosum, and Stratum Lucidum**: Intermediate layers involved in the process of keratinization. 3. **Dermis (b)**: The middle skin layer containing connective tissue, blood vessels, nerve endings, sebaceous glands (f), and sweat glands. 4. **Hair Follicle & Shaft**: The model shows a hair shaft extending from the follicle, running through the dermis. 5. **Subcutaneous Tissue**: This is the deepest layer comprising mainly fat tissues that provide insulation and cushioning. 6. **Blood Vessels and Nerves**: Visible as red and yellow strands, they are crucial for nutrient delivery and sensation. This educational model helps students visualize and understand the intricate structure and function of the skin's layers.
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