lab #7 integumentary system. overview of the integumentary system

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Lab #7 Integumentary System

Author: adam-cox

Post on 17-Dec-2015




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  • Slide 1
  • Lab #7 Integumentary System
  • Slide 2
  • Overview of the Integumentary System
  • Slide 3
  • Organization of the Epidermis: Figure 52
  • Slide 4
  • Layers of the epidermis are known as strata
  • Slide 5
  • Layers of the Epidermis Top: Free surface of skin - stratum corneum - stratum lucidum - stratum granulosum - stratum spinosum -stratum germinativum Bottom: Basal lamina
  • Slide 6
  • A note on thick vs. thin skin Thick skin has an extra layer (lucidum) but that is NOT the reason that it is thicker than thin skin. Real reason is the other layers are thicker in thick skin than in thin skin.
  • Slide 7
  • The Dermis Deeper part of cutaneous layer Located between epidermis and subcutaneous layer Anchors epidermal accessory structures (hair follicles, sweat glands) Has 2 components: outer papillary layer deep reticular layer
  • Slide 8
  • The Papillary Layer Consists of areolar tissue Contains smaller capillaries, lymphatic vessels, and sensory neurons Has dermal papillae projecting between epidermal ridges
  • Slide 9
  • The Reticular Layer Consists of dense irregular connective tissue Contains larger blood vessels, lymph vessels, and nerve fibers Contains collagen and elastic fibers
  • Slide 10
  • Integumentary Accessory Structures Hair, hair follicles, sebaceous (oil) glands, sweat glands, and nails: are derived from embryonic epidermis are located in dermis project through the skin surface
  • Slide 11
  • The Hair Follicle Is located deep in dermis Is made of epidermal tissue (with connective tissue around the outside) Produces nonliving hairs Is wrapped in a dense connective-tissue sheath Base is surrounded by sensory nerves
  • Slide 12
  • Hair
  • Slide 13
  • Structures of Hair and Follicles Figure 59a
  • Slide 14
  • Accessory Structures of Hair Arrector pili: involuntary smooth muscle causes hairs to stand up produces goose bumps Sebaceous glands: lubricate the hair control bacteria
  • Slide 15
  • Inside the Follicle Figure 59b
  • Slide 16
  • Exocrine Glands in the skin Sebaceous glands and follicles (oil glands): holocrine glands secrete sebum Sweat glands: merocrine glands watery secretions
  • Slide 17
  • Types of Sebaceous Glands Sebaceous glands: associated with most hair follicles (on head and body) Sebaceous follicles: discharge directly onto skin surface found on face and trunk when clogged acne
  • Slide 18
  • Sebaceous glands
  • Slide 19
  • Types of Sweat Glands Apocrine: found in armpits, around nipples, and groin Merocrine: more numerous, widely distributed on body surface especially on palms and soles (thick skin) Both are actually merocrine
  • Slide 20
  • Apocrine Sweat Glands Merocrine secretions, not apocrine Associated with hair follicles in groin, nipples, and axillae (armpits) Become active at puberty Produce sticky, cloudy secretions (thick sweat) that breaks down and causes odor
  • Slide 21
  • Merocrine Sweat Glands Also called eccrine glands: coiled, tubular glands discharge directly onto skin surface sensible perspiration for cooling (thin sweat) water, salts, and organic compounds
  • Slide 22
  • Sweat Glands of the Skin Apocrine Merocrine
  • Slide 23
  • Epidermis What to look for: Usually darkest between stratum germinativum and stratum granulosm (granulosm often a dark meandering line) Keratinized cells (s. corneum) often lift off the underlying layers S. germinativum along basal lamina, along with melanocytes
  • Slide 24
  • Dermis: Papillary vs. Reticular layer
  • Slide 25
  • What to look for Papillary layer has ridges is areolar Just under basal lamina Reticular layer much thicker Dense irregular CT Hypodermis Loose CTP
  • Slide 26
  • More skin
  • Slide 27
  • Merocrine sweat gland What to look for Found in most skin Coiled, tubular Small lumens in cross section Have duct that goes all the way to the epidermal surface and ends in sweat pore Smaller than apocrine, dont extend as deep into dermis
  • Slide 28
  • Apocrine sweat gland What to look for: Associated with hair follicle Only in nipples, groin, armpit Large lumens Deeper in dermis than merocrine
  • Slide 29
  • Apocrine sweat gland
  • Slide 30
  • Hair with sebaceous glands and arrector pilli
  • Slide 31
  • Hair What to look for: Follicles are rarely complete Can often see root, papilla at base of hair Arrector pilli muscle at an angle Associated glands (which are?)
  • Slide 32
  • Sebaceous glands
  • Slide 33
  • What to look for: Associated with hair follicle Found most everywhere hair follicles are found in skin Look like cauliflower (maybe?)
  • Slide 34
  • Sebaceous follicle
  • Slide 35
  • What to look for: Also look like cauliflower Found on face and trunk only NOT associated with hair follicle Have duct that opens onto skin surface
  • Slide 36
  • Lab Activity #7 Look at slides: Axillary skin (armpit) Pigmented and Nonpigmented thin skin slide Scalp
  • Slide 37
  • What will you find there? Armpit Scalp Hair? Hair follicle? Sebaceous gland? Sebaceous follicle? Apocrine sweat gland? Merocrine sweat gland? ? Y Y Y Y Y Y Y Y N N Y
  • Slide 38
  • Pigmented Thin Skin Find: Epidermis Identify layers, starting with germinativum Find melanocytes Dermis Papilary and reticular CT layers Hypodermis
  • Slide 39
  • Axillary skin Locate: an apocrine sweat gland. a merocrine sweat gland also look for a sebaceous follicle (not associated with a hair)
  • Slide 40
  • Turn in one drawing page with Three types of glands (one sebaceous, a merocrine sweat gland and an apocrine sweat gland) Epidermis (label the four layers) Dermis (label papillary and reticular) Hair follicles and shaft (label follicle, sebaceous gland, arrector pilli muscle if seen)
  • Slide 41
  • Assignment For Next Thursday turn in: Your drawing Review Sheet #7 (you do not have to do the parts about plotting sweat glands and fingerprinting on page 104)