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Understanding the Dermis: Structure and Function in Skin Histology

The dermis is a critical layer of skin histology primarily made up of irregular dense fibrous connective tissue, varying in thickness depending on body location. It consists of two main regions: the papillary region—comprising areolar connective tissue and dermal papillae, which enhance nutrient exchange; and the reticular region—composed of dense connective tissue that provides strength and elasticity. This layer houses blood vessels, nerves, sensory receptors, sweat and oil glands, and hair follicles, contributing to the skin's overall functionality and sensation.

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Understanding the Dermis: Structure and Function in Skin Histology

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  1. Chapter 5 Skin Histology Dermis J.F. Thompson, Ph.D.

  2. The Dermis - General • primarily irregular dense fibrous conn. tissue • variable thickness - thicker on palms and soles; thicker on dorsal surfaces rather than on ventral; thicker on lateral surfaces rather than on medial surfaces • few cells present - fibroblasts, macrophages, adipocytes • matrix thick with many protein fibers: collagen, elastin, reticular • the location for blood vessels, nerves and sensory receptors, sweat and oil glands, and hair follicles

  3. Dermis - Structure • Papillary region (layer) - superficial layer - 20% • areolar connective tissue, elastic fibers • dermal papillae – mound-like projections to increase the surface area for nutrition from capillaries • some papillae contain Meissner's corpuscles (for light touch)

  4. Dermis – Structure (cont.) • Reticular region - 80% • dense, irregular fibrous connective tissue • collagen, elastic fibers in a network surrounding the various cells • fibers give strength, elasticity, extensibility • tears in reticular region - "stretch marks“ - long straight red or white streaks

  5. Dermis Papillary and Reticular Regions

  6. Meissner’s Corpuscles

  7. Pacinian Corpuscles

  8. End Ch 5 Skin Histology Dermis

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