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Anatomy-Skin
Skin and Integumentary System
Question | Answer |
---|---|
Name the two skin layers? | Epidermis (most outer) and Dermis (true skin) |
Layers of the epidermis? | No blood vessels-1. Horny layer (stratum corneum)2. Clear or translucent (stratum lucidum)3. Granular layer (stratum granulosum)4. Prickle cell (stratum sinosum)5. Germinal or basal (stratum germinativum)skin color. |
Layers of the Dermis? | Innermost- 1.Papillary layer (finger prints)2.Reticular layer (blood & nerves pass through) |
What is Modified Epidermis? | Hair |
Layers of Hair? (modified Epidermis) | 1.Shaft-visible part 2.Hair follicle-small canal on skin surface. 3.Root-part of hair below skin surface 4.Bulb-inner enlarged end of root germinal cell(makes hair grow)5. Sebaceous glands (oil)small secreting glands alongside hair follicles. |
What are nails? | Keratinized Epidermis, stratum lucidum thickened. Protects fingers and toes. |
Parts of the Nail? | Nail Root-proximal part covered by skin. Germinated cels are here.2. Body - exposed part. 3. Lunula-half moon shaped white part |
Layer just below skin? Loose connective tissue between skin and other structures? | Hypodermis (subcutaneous tissue)-fat cells are here for insulation. Blood vessela & nerve fibers pass through here to dermis. |
What are organized units of epithelial cells? | Glands |
What are tube like glands with a single canal (duct) & a coiled secreting part.Duct opens onto skin surface (pores).Mostly in palms of hands, soles of feet & axillae, because of friction in those areas. | Sweat glands |
What is ear wax? | Ceruminous glands; modified sweat glands in the external ear, secrete wax into external auditory meatus (EAM) |
What do sweat glands do? | Secrete a watery fluid containing NaCL2, urea & other waste products. Lowers body temp. Rids body of excess fluid. |
Endocrine glands? | Ductless glands, discharge hormones directly into blood or lymph capillaries. EX;pituitary, thyroid,suprarenal & pancreas glands. |
Exocrine glands? | Have ducts, secretions pass through duct into a cavity, hollow organ or skin. EX; sweat, sebaceous, salivary, tear & mammary glands. |
What are mammary glands? | Breasts, female develop them at puberty from hormones stimulation (estrogen & progesterone) |
The functional part of the breast? | Mammary glands-@ 20 lobes per breast, milk drains from lobes into lavtiferous ducts. Purpose is to secrete milk for offspring. |
Classifications of Exocrine glands? | 1. Simple tubular (single tube secreting)2. Branced tubular3. Simple saccular (alveolar gland)4. Branched saccular (alveolar gland)5. Combined tubuloalveolar |