Integument Department of Biology, WCU.

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Presentation transcript:

Integument Department of Biology, WCU

Functions of skin Protection Temperature regulation Secretion Sensory perception

Introduction Covering Contains Thickness 3 layers blood vessels, nerves, glands, receptors Thickness 3 layers epidermis dermis hypodermis

Epidermis Derived from …… Non-vascularized Layered Stratified squamous

Epidermal layers 1. Corneum 2. Lucidum dead 2/3 thick replaced only thick skin thin

Epidermal layers 3. Granulosum 4. Spinosum 5. Basale flat glycoprotein keratinized 5. Basale single row mitosis

Epidermal cells 1. Melanocytes 2. Langerhans cells 3. Merkel cells melanin: skin color and protection 2. Langerhans cells bone marrow, immune response 3. Merkel cells sensory function 4. Keratinocytes protection

Dermis Derived from …… Highly vascularized Innervated Tatoos

Dermal layers 1. Papillary layer - thin, loose connective tissue - dermal papillae

Dermal layers 2. Reticular layer - 80% - dense connective tissue - nerves, glands, blood vessels

Hypodermis Shares characteristics of skin Functions anchorage absorbs shock prevents heat loss

Epidermal derivatives 1. Hair (pili) warm, sensing, protection growth: dermis/hypodermis arrector pili

Epidermal derivatives 2. Nails from lucidum, corneum

Epidermal derivatives 3. Glands sweat glands Eccrine (hands, feet) Apocrine (genitals) oil glands (sebum) Lubrication Kills bacteria Reduce water loss