Overview of the Integumentary System. Lab #7. Layers of the epidermis are known as strata. Organization of the Epidermis: Layers of the Epidermis
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1 Overview of the Integumentary System Lab #7 Integumentary System Organization of the Epidermis: Layers of the epidermis are known as strata Figure 5 2 Layers of the Epidermis Top: Free surface of skin - stratum corneum - stratum lucidum - stratum granulosum - stratum spinosum - stratum germinativum Bottom: Basal lamina 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. 1
2 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 The Papillary Layer Consists of areolar tissue Contains smaller capillaries, lymphatic vessels, and sensory neurons Has dermal papillae projecting between epidermal ridges The Reticular Layer Consists of dense irregular connective tissue Contains larger blood vessels, lymph vessels, and nerve fibers Contains collagen and elastic fibers 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 The Hair Follicle Hair 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 2
3 Structures of Hair and Follicles Accessory Structures of Hair Arrector pili: involuntary smooth muscle causes hairs to stand up produces goose bumps Sebaceous glands: lubricate the hair control bacteria Figure 5 9a Inside the Follicle Exocrine Glands in the skin Sebaceous glands and follicles (oil glands): holocrine glands secrete sebum Sweat glands: merocrine glands watery secretions Figure 5 9b Types of Sebaceous Glands 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 3
4 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) 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 Both are actually merocrine Merocrine Sweat Glands Sweat Glands of the Skin Also called eccrine glands: coiled, tubular glands discharge directly onto skin surface sensible perspiration for cooling (thin sweat) water, salts, and organic compounds Apocrine Merocrine Epidermis Dermis: Papillary vs. Reticular layer 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 4
5 What to look for More skin Papillary layer has ridges is areolar Just under basal lamina Reticular layer much thicker Dense irregular CT Hypodermis Loose CTP 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, don t extend as deep into dermis Apocrine sweat gland Associated with hair follicle Only in nipples, groin, armpit Large lumens Deeper in dermis than merocrine Apocrine sweat gland Hair with sebaceous glands and arrector pilli 5
6 Hair Follicles are rarely complete Can often see root, papilla at base of hair Arrector pilli muscle at an angle Associated glands (which are?) Sebaceous glands Sebaceous glands Sebaceous follicle Associated with hair follicle Found most everywhere hair follicles are found in skin Look like cauliflower (maybe?) Sebaceous follicle Also look like cauliflower Found on face and trunk only NOT associated with hair follicle Have duct that opens onto skin surface Lab Activity #7 Look at slides: Axillary skin (armpit) Pigmented and Nonpigmented thin skin slide Scalp 6
7 What will you find there? Pigmented Thin Skin Armpit Hair? Hair follicle? Sebaceous gland? Sebaceous follicle?? Apocrine sweat gland? Merocrine sweat gland? Scalp N N Find: Epidermis Identify layers, starting with germinativum Find melanocytes Dermis Papilary and reticular CT layers Hypodermis Axillary skin Turn in one drawing page with Locate: an apocrine sweat gland. a merocrine sweat gland also look for a sebaceous follicle (not associated with a hair) 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) Assignment For Next Thursday turn in: our drawing Review Sheet #7 (you do not have to do the parts about plotting sweat glands and fingerprinting on page 104) 7
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