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Membranous tissue composed of one or more layers of cells
* Covering most internal and external surfaces of the body and internal surfaces and its organs |
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The epidermis is the skin's outer structure serving a protective function.
THE EPITHELIUM COVERING THE SURFACE OF THE SKIN |
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THE 20 LAYERS OF CONNECTIVE TISSUE BENEATH THE EPIDERMIS OF THE SKIN
(10 LAYERS = DEAD + 10 LAYERS = KEROTIN) |
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| SUBCUTANEOUS - HYPODERMIS |
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| LAYER OF LOOSE CONNECTIVE TISSUE BELOW THE DERMIS; ALSO CALLED SUBCUTANEOUS LAYEROR SUPERFICIAL FACIA |
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* Protects from environmental hazards
* Maintains Body Temperature
* Excretes salts, water & waste
* Produces melanin / keratin
* Detects sensory information
* Co-Ordinates Immune System |
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* Produces hairs that protect the skull
* Produces hairs that provide touch sensations on body surface |
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| SEBACEOUS GLANDS FUNCTION |
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* Secrete sebum, which coasts hair follicle & surrounding epidermal surface
* Sebum provides lubrication & antibacterial properties |
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* Non growing portion of hair that protrudes from the skin
* Provides structure for hair that is present outside the skin |
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| Communication - passing electrical / chemical messages from neuron to / from neuron to other target cells |
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| Distribute blood around the body |
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| ARRECTOR PILI MUSCLE FUNCTION |
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| Smooth muscles whose contractions force hairs to stand on end |
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| SUDORIFEROUS (SWEAT) GLAND |
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Definition
* Discharge sweat by tiny openings in the surface of the skin.
* Flushes epidermal surface & performs other special functions |
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| A sweat pore is a small opening on the skin, and serves as the passage for fluid from the duct of a sweat gland to the top layer, or dermis. |
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| Thick sheets of keratinized epidermal cells that protect the tips of the fingers and nails. |
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| STATE THE NAILS FUNCTIONS |
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* Protect the exposed dorsal surfaces of the finger tips and toes
* Keep digits from distorting under mechanical stress eg, running / grasping object |
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