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Anatomy
Chapter 5 The Integumentary System
| Question | Answer |
|---|---|
| 3 major skin regions | epidermis, dermis, hypodermis |
| superficial skin region | epidermis |
| middle skin region | dermis |
| deepest skin region | hypodermis, subcutaneous layer under skin, mostly adipose tissue |
| keratinized stratified squamous epithelium | epidermis |
| contains melanocytes that produce skin pigment | epidermis |
| 5 layers of epidermis, bottom to top | stratum basale, spinosum, granulosum, lucidum, corneum |
| deepest layer firmly attached to dermis | stratum basale |
| single row of stem cells that undergo rapid division | stratum basale |
| web-like system of intermediate filaments attached to desmosomes | stratum spinosum |
| abundant melanin granules and dendritic cells | stratum spinosum |
| thin, 3 to 5 cell layers where cells flatten | stratum granulosum |
| keratohyaline and lamellated granules accumulate | stratum granulosum |
| only on think skim, palmar, plantar | stratum lucidum |
| thin, clear band above stratum granulosum | stratum lucidum |
| 3/4 thickness of epidermis | stratum corneum |
| protects from abrasion and penetration, waterproofs, acts as barrier | stratum corneum |
| strong flexible connective tissue (dense regular), cells include fibroblasts, macrophages, mast cells, white blood cells | dermis |
| 2 layers of the dermis | papillary layer, reticular layer |
| areolar connective tissue with collagen and elastic fibers and blood vessels | papillary layer |
| dermal papillae contain capillary loops and free nerve endings | papillary layer |
| 80% thickness of the dermis | reticular layer |
| collagen fibers provide strength and resiliency | reticular layer |
| elastic fibers provide stretch-recoil properties | reticular layer |
| 2 types of sweat/sudoriferous glands | eccrine and apocrine |
| glands that release sweat | eccrine glands |
| ducts connect to pores | eccrine glands |
| glands confined to axillary and anogenital areas | apocrine glands |
| release sebum | apocrine glands |
| sweat + fatty substances + protein | sebum |
| glands functional from puberty on | apocrine glands |
| secrete cerumen (wax) | ceruminous glands |
| produce milk | mammary glands |
| widely distributed glands, develop from hair follicles, secrete sebum | sebaceous/oil glands |
| dead keratinized cells | hair |
| hair pigments | melanins |
| sensory nerve endings around each hair bulb, stimulated by bending hair | hair follicle receptor (root hair plexus) |
| smooth muscle attached to follicle, responsible for goose bumps | arrector pili |