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cells of epidermis - two layers a papillary layer mainly...

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cells of epidermis: Human Anatomy & Physiology: Integumentary System, Lecture Notes, Ziser, 2005 3 1. stem cells undifferentiated cells found only in deepest layer 2. keratinocytes most cells in epidermis synthesize keratin 3. melanocytes also in deepest layer synthesize pigment melanin 4. Merkel cells touch receptors, attached to nerve cell 5. dentritic cells (Langerhans cells) found in s spinosum and s granulosum are macrophages that stand guard against toxins, microbes and other pathogens that penetrate the skin if detected they alert immune system Dermis (=hide) strong, flexible, connective tissue gives skin its strength and resilience gel-like matrix contains collagen, elastic and reticular fibers rich in nerves, receptors, blood vessels, lymph vessels hair follicles and sweat glands extend into it
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Unformatted text preview: two layers: a. papillary layer mainly areolar connective tissue lots of blood vessels dermal papillae capillary loops sensory cells produce finger prints b. reticular layer mainly dense (irregular connective tissue) lots of collagen fibers lines of cleavage between collagen bundles ‡ tension lines longitudinal in limbs circular around trunk incisions parallel to lines heal quicker dermal tearing = stretch marks (silvery) Subcutaneous Layer Human Anatomy & Physiology: Integumentary System, Lecture Notes, Ziser, 2005 4 = hypodermis or superficial fascia below skin mainly adipose tissue (ie subcutaneous fat) insulation infants and elderly have less of this than adults and are therefore more sensitive to cold...
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