Ch 5 Integumentary (1).ppt - Human Anatomy and Physiology I...

This preview shows page 1 - 12 out of 35 pages.

Chapter 5BSC 2085Human Anatomy and Physiology IThe Integumentary System
Chapter 5 OutlineOverview of the skin EpidermisDermisHypodermisAppendages of the skinSweat glands, Sebaceous glands, Hair,NailsFunctionsSkin CancersBurns
Skin (Integument)Consists of three major regions1.Epidermis—superficial region2.Dermis—middle region3.Hypodermis—deepest region
Integumentary SystemSkin7% of body weightTwo main parts1. Epidermis-replaced every 25-45 days-keratinized stratified squamous epithelium
Layers1. Stratum basale: on top of dermis2.Stratum spinosum: “prickly layer”several layers thick; melanin granules; Langerhans cells present3.Stratum granulosum: 3-5 layers thicka. Keratohyaline granules: form keratinb. Lamellated granules: waterproof4.Stratum lucidum: clear layer on palms and soles only; thick layer5.Stratum corneum: outer layer; 20-30 cell layers thick; keratinized; thick plasma membranesIntegumentary System
Background image
Cells
;
Integumentary System
Background image
Integumentary System
Layers of Dermis1. Papillary- thin, superficial- areolar connective tissue- dermal papilla: fingerprint ridges* Contain pain receptors* Meissner’s corpuscles: touch2. Reticular layer-deeper, 80% thickness of dermis-dense, irregular tissue-fibers: collagen, elastinIntegumentary System
EpidermisHair shaftDermisReticularlayerPapillarylayerHypodermis

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture