Organization – Skin Epidermis Dermis – Accessory Structures Hair & Hair follicles Exocrine glands Arrector pili Sensory Receptors

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  • Organization Skin Epidermis Dermis

    Accessory Structures Hair & Hair follicles Exocrine glands Arrector pili Sensory Receptors

  • Layers beneath the skin Subcutaneous layer Deep fascia________________________

  • Functions of the Skin Protection Water-resistance Temperature regulation Vitamin D synthesis Sensations Immunity Social signaling

  • The EpidermisStratum Germinativum Stem cells Melanocytes Merkel cells

  • The Epidermis S. Spinosum Pre-keratinocytes Melanocytes Langerhans cells

  • The Epidermis S. Granulosum S. Lucida Keratinocytes in both layers

  • The Epidermis S. Corneum Dead keratinocytes

  • Skin cell-eating mite

  • The Dermis

  • The DermisReticular layer Dense irregular CT Provides strength and elasticity

  • The DermisPapillary layer Areolar CT Contains caps and sensory neurons for epidermis Arranged as dermal papillae

  • PigmentationMelaninCaroteneHemoglobin

  • Epidermal Derivatives Hair Follicles and Hair Skin Glands

  • HairFunction Protection Touch SensationStructure Root Shaft Bulb

  • HairHair Follicle Sheath of epithelial cells Surrounds root Merges with bulb

  • HairAssociated structures Dermal papilla Sebaceous glands Arrector pili

  • HairGrowth Cycle 2-5 yrs: growth stage 2 yrs: resting stage

  • Skin GlandsSebaceous glands secrete sebum help to protect hair and skin

  • Skin GlandsMerocrine (eccrine) sweat glands BT control excretion protection

  • Skin GlandsApocrine sweat glands Secrete pheromones?

  • Skin GlandsMammary glandsCeruminous glands

  • Skin Sensory ReceptorsFree nerve endingsPacinian corpuscles Meissners corpuslces

  • Lines of Cleavage

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