skin, hair and nails. skin 2 layers of skin outer epidermis inner supportive dermis 3 rd layer of...
TRANSCRIPT
Skin, Hair and Nails
Skin 2 Layers of Skin
Outer Epidermis Inner supportive Dermis
3rd Layer of Subcutaneous Adipose
Epidermis Protective Stratified into several zones
Basal cell layer = forms new skin cells Keratin = major ingrediant Melanin = # but amt of production varies
Uniformly thin except on palms and soles Avascular
Vesicle, Bulla
Skin Color Melanin Carotene pigment Vascular beds in the dermis Affected by skin thickness & edema
Dermis Supportive layer Collagen Elastic quality for stretching Nerves, sensory receptors, bld. vessels,
lymphs Epidermis appendages = hair follicles,
sebacceous glands, sweat glands embedded in the dermis
Hair Important because? Threads of keratin 2 types
Vellus hair- over body Terminal hair
Glands Sebaceous Glands
Sebum = protective lipid substance Lubricates hair& skin prevents water loss everywhere but palms & soles
Sweat Glands Eccrine = skin surface- sweat Apocrine = thick, milky secretion – axilla,
anogenital, nipples, navel.
Nails Keratin Color Condition Shape, Profile sign
Function of Skin Protection Prevents penetration Perception Temperature regulation Identification Communication Wound repair
Function of Skin Absorption & excretion Vitamin D – ultraviolet light > cholesterol