Accessory Organs of the Skin

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Integumentary System Accessories
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Presentation transcript:

Accessory Organs of the Skin Chapter 4

Accessory Organs Glands Hair Nails

Glands Organ that releases a substance into or out of the body Sebaceous (oil) glands Sudoriferous (sweat) glands

Sebaceous (oil) Glands All over the body (except palms and soles) Secrete sebum Oily mixture of cholesterol and cellular debris Human defensin (antimicrobial substance) Keeps the hair and skin soft & pliable Prevent water evaporation Open onto a hair follicle Increase secretion in response to sex hormones Puberty

Sebaceous Gland Disorders Acne vulgaris Overactive/inflammed sebaceous glands Caused by hair follicles blocked with sebum Inflammatory response causes small red elevation

Sudoriferous (sweat) Glands Coiled, tubular glands located in the dermis On average, 1 in2 of skin contains _____ sweat glands? 650 Eccrine sweat glands Apocrine sweat glands

Eccrine Glands Forehead, neck, back Open onto skin surface Begin functioning at birth Respond throughout life due to body temperature Produce sweat that assists in regulating body temperature 99% water Salt, urea, lactic acid Composition varies with diet/heredity

Apocrine Glands Genital/anal regions; axillary region Open onto a hair follicle, not the skin Begin functioning at puberty, under the influence of sex hormones Sweat does not assist in temperature regulation Sweat is more viscous (sticky/thick) Yellow-white/milky color Odorless when secreted Bacteria metabolize the sweat and secrete waste  body odor

Specialized Sweat Glands Mammary glands Secrete milk Modified sweat glands Ceruminous glands External ear canal Secrete cerumin (earwax) Repels insects, traps dust

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