1 / 16

Understanding the Integumentary System: Skin Anatomy & Physiology

Dive deep into the layers and functions of the integumentary system, exploring how skin regulates body temperature, protects tissues, and aids in sensations, excretion, immunity, and more. Learn about the epidermis, dermis, skin color, and the intricate structures that make up the skin.

keitha
Download Presentation

Understanding the Integumentary System: Skin Anatomy & Physiology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Integumentary System Ch. 5 Part 1

  2. Integumentary System Anatomy Physiology Regulate body temperature Protects connective tissues Sensations – touch, temperature, pressure, pain Excretion – water, salts, heat Immunity Blood reservoir – many tiny blood vessels Makes vitamin D • Epidermal layer • Dermal layer

  3. Cross Section of Skin

  4. Skin has 2 layers • Epidermis– outer, thinner portion composed of epithelium • Dermis – inner, thick part composed of connective tissue

  5. Epidermis • Keratinized stratified squamous epithelium cells • Keratinocytes – produce protein keratin • Keratin – fibrous protein for waterproofing and insulation • Melanocytes – produce melanin • Melanin – pigment for skin color and absorbs UV light

  6. Epidermis – deep to superficial layers Thin skin – most of the body Thick skin – palms, soles of feet Stratum basale (stratum germinativum Stratum spinosum Stratum granulosum Stratum lucidum Stratum corneum (thick layer • Stratum basal (stratum germinativum) • Stratum spinosum • Stratum granulosum • Stratum corneum (thin layer)

  7. Stratum Germinativum (basale) • Basal (base) cell layer (germinal) undergoes continuous mitotic division • Produces all the other layers • Made up of stem cells • Simple cuboidal or columnar

  8. Stratum spinosum • When prepared, shrink to have thorn-like projections • Have melanocytes and Langerhans cells • Help with skin immunity to microbes

  9. Stratum granulosum • Cell apoptosis occurs here • Contains lamellar granules – provide waterproof sealant to skin • Transition between alive layers and dead layers of skin

  10. Stratum lucidum • Consists of flattened, dead, clear keratinocytes

  11. Stratum corneum • Keratinization – accumulation of keratin by moving through epidermal layers • Dead cells are sloughed off (shed) and replaced by newly dead cells from deeper layers • Made up of dead stratified squamous cells • Callus – abnormal thickening of stratum corneum

  12. Dermis • Composed of connective tissue • Blood vessels, nerves, glands, hair follicles • 2 regions • Papillary • Reticular

  13. Papillary region • Consists of areolar C.T with elastic fibers • Dermal papillae – projections into the dermis create ridges: fingerprints • Contain tactile receptors – corpuscles of touch • Nerves sensitive to touch • Pacinian corpuscles – sensitive to pressure • Free nerve endings – sensitive to temperature

  14. Reticular region • Made of connective tissue, mainly collagen and elastic fibers • Also contains • Adipose tissue • Hair follicles • Nerves • Oil glands • Sweat glands

  15. Skin color • Genetically determined • Melanin – brown-black pigment, number the same in all races; production of melanin differs • Carotene – yellow-orange pigment • Hemoglobin – reddish/pinkish tint in Caucasians

More Related