Anatomy 403 E3 Integumentary.pptx - THE INTEGUMENTARY SYSTEM FUNCTIONS Protection Thermoregulation Blood reservoir Synthesis of vitamin D Excretion

Anatomy 403 E3 Integumentary.pptx - THE INTEGUMENTARY...

This preview shows page 1 - 18 out of 93 pages.

THE INTEGUMENTARY SYSTEM: FUNCTIONS Protection Thermoregulation Blood reservoir Synthesis of vitamin D Excretion & absorption Cutaneous sensation
Image of page 1
THE INTEGUMENTARY SYSTEM Integument Inte whole gument body covering Integument Consists of: Skin (cutis/ cutaneous membrane) Subcutaneous tissue (Hypodermis) skin Subcutaneous tissue Skin appendages: - Cutaneous glands (sweat and oil glands) - Hair - Nails
Image of page 2
INTEGUMENT: LAYERS Skin (cutis) Hypodermis Aka subcutaneous tissue/ superficial fascia skin Epidermis Dermis Epidermis Dermis Hypodermis Integument 2 layers of skin + 1 associated layer = Integument
Image of page 3
Skin (cutis) = Epidermis + Dermis Epidermis Superficial, thinner portion Composed of epithelial tissue Ectodermal origin Like all epithelial tissue – avascular! Dermis Deeper, thicker portion Composed of CT Contains nerves, blood vessels, glands, hair follicles, and muscles Mesodermal origin Epidermis Dermis THE INTEGUMENT: SKIN
Image of page 4
THE INTEGUMENT: HYPODERMIS Connective tissue layer underneath dermis NOT SKIN Differs from region to region Consists of adipose and areolar tissues Fat storage and large blood vessels Nerve endings Mesodermal origin Functions: Energy storage Insulation Anchoring of skin Cushion underlying tissues Epidermis Dermis Hypodermis
Image of page 5
INTEGUMENT
Image of page 6
SKIN: EPIDERMIS Keratinized stratified squamous epithelial tissue Keratin: tough, fibrous intracellular protein Stratified: consists of 2+ layers Protects deep tissue Squamous: flat & thin cell shape
Image of page 7
Keratinocytes Melanocytes Langerhans cells (dendritic cells) Merkel (tactile epithelial) cells EPIDERMIS: CELL TYPES OF THE EPIDERMIS
Image of page 8
CELL TYPES OF THE EPIDERMIS: KERATINOCYTES Keratinocytes 90% of epidermal cells Produces keratin protein PROTECTION Produce lamellar granules Water-repellent sealant Decreases water entry/loss Inhibits passage of foreign materials
Image of page 9
CELL TYPES OF THE EPIDERMIS: KERATINOCYTES
Image of page 10
CELL TYPES OF THE EPIDERMIS: KERATINOCYTES Desmosomes Keratin intermediate filaments (tonofilaments) Within cytoskeleton of keratinocytes (basal layer) Form keratin in more superficial epidermal layers Tight intercellular junctions
Image of page 11
CELL TYPES OF THE EPIDERMIS: MELANOCYTES Melanocytes 8% of epidermal cells Produces melanin pigment Skin color UV light Have long arm-like processes extending from cell body Project b/w neighboring keratinocytes
Image of page 12
CELL TYPES OF THE EPIDERMIS: MELANOCYTES Dermis Melanocytes
Image of page 13
~ Same # of melanocytes in everyone DIFFERING amounts of the pigment produced & transferred to keratinocytes CELL TYPES OF THE EPIDERMIS: MELANOCYTES
Image of page 14
CELL TYPES OF THE EPIDERMIS: LANGERHANS CELLS Langerhans cells (dendritic cells) Macrophage cells Immune responses Arise from red bone marrow & migrate to epidermis
Image of page 15
CELL TYPES OF THE EPIDERMIS: LANGERHANS CELLS Langerhans cells Dermis
Image of page 16
Merkel (Tactile Epithelial) Cells
Image of page 17
Image of page 18

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture