IntegumentII

IntegumentII - The Integumentary System II Announcements...

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The Integumentary System II
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Announcements Exam questions for integument lectures will be based on information presented in powerpoint slides
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Review: Layers of Skin • Epidermis stratum disjunctum/disruptum stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum basale/germinativum • Dermis • Hypodermis
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Today Dermis Glands Chromatophores Sensory receptors Vascular supply Hair
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Layers of Skin • Dermis (Corium) - Located beneath the epidermis and basement membrane - Consists of dense irregular connective tissue with a network of collagen, elastic, and reticular fibers embedded in amorphous substance - Contains white blood cells, blood vessels, lymphatic vessels, nerves, glands, hair follicles, smooth muscle (arrector pili muscles)
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Dermis • 2 Layers: - Papillary Dermis - Reticular Dermis • Papillary layer blends into recticular layer without a clear line of demarcation
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Papillary Dermis • Thinnest layer • Immediately adjacent to the stratum basale of the epidermis • Conforms to the contour of the stratum basale • Loose connective tissue, many capillaries which supply the epidermis with nutrients • Contains nerve endings and sensory organs
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Reticular Dermis • Thicker layer • Thick arrays of collagen (dense irregular connective tissue), highly vascularized • Adjacent to the hypodermis, this is sometimes referred to as the stratum compactum
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5= epidermis 3= dermis Dermal papilla: Where papillary layer protrudes into the epidermis Reticular dermis
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The epidermis and dermis are held together by a series of intercalations. Here, the epidermis is stripped away and you can see the dermal papilla which extend up into the epidermis. Hair follicle The epidermis and dermis are tightly interlocked
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This cross-section of the skin at the level of the stratum spinosum (12) shows how the dermal papillae (pegs) (2) and intercalated with the epidermis. The cells of the stratum germinativum (10) are immediately adjacent to the connective tissue of the dermal papillae. Vascular beds of the dermal papillae
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The reticular dermis is composed of extensive collagenous extracellular matrix, as well as a rich plexus of blood vessels and nerves.
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The dermis found in fish is composed of tightly woven bundles of collagen shown here in bright pink and purple. This very thick layer provides a solid protective layer, which is referred to as the stratum compactum.
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fibers that give strong structural support and flexibility to the outer body wall. Sea Squirt/ a type of protochordate
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This note was uploaded on 04/05/2011 for the course APC 100 taught by Professor Kelliewhited during the Spring '07 term at UC Davis.

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IntegumentII - The Integumentary System II Announcements...

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