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Appendages of the Skin

Appendages of the Skin. Hair Produced by hair bulb Consists of hard keratinized epithelial cells Melanocytes provide pigment for hair color. Figure 4.7c. Hair Anatomy. Central medulla Cortex surrounds medulla Cuticle on outside of cortex Most heavily keratinized. Figure 4.7b.

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Appendages of the Skin

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  1. Appendages of the Skin • Hair • Produced by hair bulb • Consists of hard keratinized epithelial cells • Melanocytes provide pigment for hair color Figure 4.7c

  2. Hair Anatomy • Central medulla • Cortex surrounds medulla • Cuticle on outside of cortex • Most heavily keratinized Figure 4.7b

  3. Associated Hair Structures • Hair follicle • Dermal and epidermal sheath surround hair root • Arrector pilli • Smooth muscle • Sebaceous gland • Sweat gland Figure 4.7a

  4. Appendages of the Skin • Nails • Scale-like modifications of the epidermis • Heavily keratinized • Stratum basale extends beneath the nail bed • Responsible for growth • Lack of pigment makes them colorless

  5. Nail Structures • Free edge • Body • Root of nail • Eponychium – proximal nail fold that projects onto the nail body Figure 4.9

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