Integumentary system Organization Skin Epidermis Dermis Accessory Structures
- Slides: 42
Integumentary system
• 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
ØThe Epidermis – Stratum Germinativum • Stem cells • Melanocytes • Merkel cells
ØThe Epidermis – S. Spinosum • “Pre-keratinocytes” • Melanocytes • Langerhans cells
ØThe Epidermis – S. Granulosum – S. Lucida • Keratinocytes in both layers
ØThe Epidermis – S. Corneum • Dead keratinocytes
Skin cell-eating mite
ØThe Dermis
ØThe Dermis • Reticular layer – Dense irregular CT – Provides strength and elasticity
ØThe Dermis • Papillary layer – Areolar CT – Contains cap’s and sensory neurons for epidermis – Arranged as dermal papillae –
Specializations of epithelium • • Perform secretory functions Perform transport functions Maintain physical integrity Ciliated epithelia move materials across their surface
The Polarity of Epithelial Cells
Maintaining the integrity of epithelium • Cells attach via cell adhesion molecules (CAM) • Cells attach at specialized cell junctions – Tight junctions – Desmosomes – Gap junctions
Intercellular connections Animation: check tutorials
Structure of typical epithelium • Basal lamina attaches to underlying surface – Lamina lucida – Lamina densa • Germinative cells replace short-lived epithelial cells
Classification of epithelia • Number of cell layers – Simple – Stratified • Shape of apical surface cells – Squamous – Cuboidal – Columnar
Squamous Epithelia
Cuboidal Epithelia
Cuboidal Epithelia
Transitional Epithelium
Columnar Epithelia
Columnar Epithelia
Columnar Epithelia
ØPigmentation • Melanin • Carotene • Hemoglobin
Ø Epidermal Derivatives • Hair Follicles and Hair • Skin Glands
ØHair • Function – Protection – Touch Sensation • Structure – Root – Shaft – Bulb
ØHair • Hair Follicle – Sheath of epithelial cells – Surrounds root – Merges with bulb
ØHair • Associated structures – Dermal papilla – Sebaceous glands – Arrector pili
ØHair • Growth Cycle – 2 -5 yrs: growth stage – 2 yrs: resting stage
ØSkin Glands • Sebaceous glands – secrete sebum – help to protect hair and skin
ØSkin Glands • Merocrine (eccrine) sweat glands – BT control – excretion – protection
ØSkin Glands • Apocrine sweat glands – Secrete pheromones?
ØSkin Glands • Mammary glands • Ceruminous glands
ØSkin Sensory Receptors • Free nerve endings • Pacinian corpuscles • Meissner’s corpuslces
Lines of Cleavage •
- Integumentary system the integument epidermis coloring page
- Streptekok
- Papillary dermal layer
- Integumentary accessory organs
- Skin dermis
- Figure 16-7 is a sectional view of the ovary
- Epidermis of thick skin
- Epidermis of thick skin
- Epidermis of thick skin
- Accessory structure of the skin
- Accessory structures of the eye
- Fig 19
- Pars lacrimalis
- Mm tarsales
- Accessory structure of the eye
- Accessory structure of the eye
- Organa oculi accessoria
- Skin information
- Thin skin vs thick skin
- Milady chapter 23 facial review questions
- Function of mouth in digestive system
- Accessory organs of the digestive system
- Accessory organs
- Which is an accessory organ of the digestive system
- Which is an accessory organ of the digestive system
- Skin structures
- Glands in integumentary system
- Integumentary system vocabulary
- Integumentary system fetal pig
- Organum germinativum
- Epidermis layers
- Exercise 7 the integumentary system
- Integumentary system vocab
- Integumentary system medical terminology
- Integumentary system
- Integumentary system physical examination
- Excretory system analogy
- Cat integumentary system
- The integumentary system
- Integumentary system components
- Effects of aging on the integumentary system
- Section 36-3 the integumentary system
- Integumentary system