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Anatomy 1
Integumentary System
Mrs. Shields
Lecture 3
Integumentary: Relating to the outer surface of a structure
Example, the skin and its components
Several functions
Acts as protective covering for the body
Keeps foreign objects out
Keeps what belongs inside, inside
Integumentary System
Integumentary System
Helps regulate body temperature; sweat
Helps eliminate waste; sweat
Serves as a bed for sensory nerve receptors
Allows for feeling our environment
Allows sensation; hot/cold
Layers
Made up of two primary layers
Epidermis
Dermis
Integumentary system
Epidermis: Outer primary layer
Composed primarily of epithelial tissue atop a layer of connective tissue
Contains melanin cells
Brownish-black pigment cells
Absence of melanin is called albinism
Integumentary System
Dermis: Internal primary layer
Comprised of connective tissue
Contains blood vessels, lymph vessels, and nerves of the skin
Integumentary system
Other important structures include:
Secretory structures that can manufacture secretions called glands
Sebaceous glands: Secrete sebum
AKA: oil glands
Keeps hair and skin soft and pliable
Usually attached to a hair follicle
Integumentary system
Sudoriferous glands:
AKA Sweat glands
Secrete sudor
Sudor: AKA sweat
Two types
Eccrine: Regulates body temperature
Apocrine: Releases during stress (axilla, groin)
Integumentary system
Hair
Aids in temperature control
Piloerection: erection or bristling of hairs due to the involuntary contraction of small muscles at the base of hair follicles that occurs as a reflexive response of the sympathetic nervous system especially to cold, shock, or fright
Extra protection from UV rays
Provide protection
Eyelashes, nose hair, ear hair
Integumentary system
Nails: Protects distal ends of the fingers and toes
Aids in enhancing sensitivity of fingertips by acting as a counter-force
Abnormalities can indicate disease
Integumentary System
Functions of skin
Protective covering of body
Regulate and maintain temperature
Eliminate wastes
Allows for sensory touch and feel
Integumentary System
Skin anatomy
Superficial layer = epidermis
Deeper layer = dermis
Integumentary System
Skin glands
Sweat glands (sudoriferous)
Sebaceous glands
Ceruminous glands (ear)
Integumentary
System
Ceruminous Glands:
Type of Apocrine Gland
Location: outer ear
Secretion: earwax
Ear Wax: AKA - cerumen
Thick Skin
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