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