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Questions and Answers
What kind of tissue/fibers make up the papillary layer?
What kind of tissue/fibers make up the papillary layer?
Loose connective tissue (areolar) made of collagen and elastic fibers.
Why is loose connective tissue of the papillary layer a good immune defense?
Why is loose connective tissue of the papillary layer a good immune defense?
More space in between fibers for white blood cells to move through the area and patrol for pathogens.
What are dermal papillae?
What are dermal papillae?
Papillary layer projects upward into the epidermis with capillaries and nervous tissue.
How are fingerprints produced?
How are fingerprints produced?
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What are epidermal ridges?
What are epidermal ridges?
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What kind of tissue/fibers is the reticular layer?
What kind of tissue/fibers is the reticular layer?
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What is the deeper layer in the dermis?
What is the deeper layer in the dermis?
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Where do collagen fibers from the reticular layer extend?
Where do collagen fibers from the reticular layer extend?
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What are cleavage lines?
What are cleavage lines?
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What is the function of the reticular layer?
What is the function of the reticular layer?
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What is Ehlers-Danlos syndrome?
What is Ehlers-Danlos syndrome?
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Collagen fibers and elastic fibers are arranged in parallel bundles along __________.
Collagen fibers and elastic fibers are arranged in parallel bundles along __________.
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How do cleavage lines provide a guide for incisions during surgery?
How do cleavage lines provide a guide for incisions during surgery?
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What happens if you cut against the parallel lines of the cleavage furrow?
What happens if you cut against the parallel lines of the cleavage furrow?
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Study Notes
Papillary Layer
- Comprised of loose connective tissue (areolar), containing collagen and elastic fibers.
- Supports immune defense by allowing more movement for white blood cells due to space between fibers.
- Dermal papillae project upward, containing capillaries and nerve tissue that enhance nutrient delivery and sensation.
- Fingerprints are formed by the combination of dermal papillae and epidermal ridges, known as friction ridges.
- Epidermal ridges are the downward extensions of the epidermis into the papillary layer.
Reticular Layer
- Made of dense irregular connective tissue, primarily adipose, with high collagen and elastic fiber content.
- Serves as the deeper layer of the dermis, supporting skin strength and resilience.
- Collagen fibers extend into the papillary layer above and into the hypodermis below, anchoring the skin structure.
- Contains cleavage lines, created by spaces between collagen fibers running parallel to the skin's surface.
Functions and Clinical Relevance
- The reticular layer enables the skin to resist forces from various directions, contributing to its overall integrity.
- Cleavage lines act as a guide for surgical incisions, as cuts along these lines promote quicker healing and minimize scarring by maintaining fiber integrity.
- Cutting against the cleavage lines can lead to prolonged healing and increased risk of scarring due to the elastic fibers pulling the edges apart.
- Ehlers-Danlos syndrome is a connective tissue disorder characterized by weak collagen fibers, leading to fragile skin that bruises easily and has increased stretchiness.
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Description
Flashcards on the papillary and reticular layers of the dermis, covering tissue composition, immune function, and dermal papillae.
