1. © 2014 Pearson Education, Inc. Figure 5.1 Skin structure. Hair shaft Epidermis Papillary layer Dermis Reticular layer Hypodermis (subcutaneous tissue; not part of skin) Dermal papillae Subpapillary plexus Sweat pore Cutaneous plexus Adipose tissue Nervous structures Sensory nerve fiber with free nerve endings Lamellar corpuscle Hair follicle receptor (root hair plexus) Appendages of skin Eccrine sweat gland Arrector pili muscle Sebaceous (oil) gland Hair follicle Hair root

2. Melanin is created by melanocytes and packaged in melanosomes © 2014 Pearson Education, Inc.

3. Melanocyte © 2014 Pearson Education, Inc.

4. Figure 5.1 Skin structure. Hair shaft Epidermis Papillary layer Dermis Reticular layer Hypodermis (subcutaneous tissue; not part of skin) Dermal papillae Subpapillary plexus Sweat pore Cutaneous plexus Adipose tissue Nervous structures Sensory nerve fiber with free nerve endings Lamellar corpuscle Hair follicle receptor (root hair plexus) Appendages of skin Eccrine sweat gland Arrector pili muscle Sebaceous (oil) gland Hair follicle Hair root

5. © 2014 Pearson Education, Inc. Figure 5.3 Light micrograph of the dermis identifying the papillary layer composed of areolar connective tissue and the reticular layer of dense irregular connective tissue (110x). Epidermis Papillary layer Dermis Reticular layer

6. © 2014 Pearson Education, Inc. Figure 5.1 Skin structure. Hair shaft Epidermis Papillary layer Dermis Reticular layer Hypodermis (subcutaneous tissue; not part of skin) Dermal papillae Subpapillary plexus Sweat pore Cutaneous plexus Adipose tissue Nervous structures Sensory nerve fiber with free nerve endings Lamellar corpuscle Hair follicle receptor (root hair plexus) Appendages of skin Eccrine sweat gland Arrector pili muscle Sebaceous (oil) gland Hair follicle Hair root

7. © 2014 Pearson Education, Inc. Figure 5.7a Skin appendages: Cutaneous glands. Dermal connective tissue Hair in hair follicle Sebaceous gland duct Sebaceous gland Eccrine gland Photomicrograph of a sectioned sebaceous gland (90x) Secretory cells Sweat pore

8. © 2014 Pearson Education, Inc. Figure 5.1 Skin structure. Hair shaft Epidermis Papillary layer Dermis Reticular layer Hypodermis (subcutaneous tissue; not part of skin) Dermal papillae Subpapillary plexus Sweat pore Cutaneous plexus Adipose tissue Nervous structures Sensory nerve fiber with free nerve endings Lamellar corpuscle Hair follicle receptor (root hair plexus) Appendages of skin Eccrine sweat gland Arrector pili muscle Sebaceous (oil) gland Hair follicle Hair root

9. © 2014 Pearson Education, Inc.

10. Follicle wall Peripheral connective tissue (fibrous) sheath Glassy membrane Hair root Cuticle Cortex Medulla Hair matrix Hair papilla Subcutaneous adipose tissue Epithelial root sheath External root sheath Internal root sheath Photomicrograph of longitudinal view of the hair bulb in the follicle (150x) Figure 5.5d Skin appendages: Structure of a hair and hair follicle.

11. © 2014 Pearson Education, Inc. Figure 5.6 Skin appendages: Structure of a nail. Lunule Lateral nail fold Root of nail Nail matrix Proximal nail fold Eponychium (cuticle) Free edge of nail Body of nail Phalanx (bone of fingertip) Nail bed Hyponychium

12. © 2014 Pearson Education, Inc. Figure 5.4b Dermal modifications result in characteristic skin markings. Cleavage lines in the reticular dermis

13. © 2014 Pearson Education, Inc.

18. Totals Anterior and posterior head and neck, 9% Anterior and posterior upper limbs, 18% Anterior and posterior trunk, 36% (Perineum, 1%) Anterior and posterior lower limbs, 36% 100% 41/2%41/2% 41/2%41/2%41/2%41/2% Anterior trunk, 18% 9% Figure 5.9 Estimating the extent and severity of burns using the rule of nines.

19. © 2014 Pearson Education, Inc. 1st-degree burn 2nd-degree burn Skin bearing partial thickness burn (1st- and 2nd-degree burns) Skin bearing full thickness burn (3rd-degree burn) 3rd-degree burn Figure 5.10 Partial thickness and full thickness burns.

20. © 2014 Pearson Education, Inc. Figure 5.8 Photographs of skin cancers. Basal cell carcinoma Squamous cell carcinoma Melanoma