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zoo141 Chapter 5

skin functions/layers of skin/skin cells

what are the five functions of the skin protection, vitamin d3 synthesis, excretion, sensation, temperature regulation
the epidermis is upper layer, composed of stratified squamous epithelial tissue
stratum corneum uppermost layer of the epidermis
stratum lucidum "clear" layer found only in thick skin
stratum spinosum appears spiny due to desmosomes
stratum basale bottom layer, contains basal cells
dermis is composed of papillary layer and reticular layer
papillary layer upper layer = areolar connective tissue
reticular layer lower layer = dense irregular connective tissue
hypodermis (subcutaneous tissue, or superficial fascia) = areolar and adipose connective tissue
[epidermal cell] Keratinocytes produce keratin
[epidermal cell] melanocytes produce melanin, packed in melanosomes
[epidermal cell] dendritic cells defend against microorganisms and superficial skin cancers
[epidermal cell] Merkel cells [monitored by tactile discs): touch sensation
[DERMAL CELLS AND FIBERS] collagen fibers very strong
[DERMAL CELLS AND FIBERS] elastic fibers permit stretching
[DERMAL CELLS AND FIBERS] lamellated corpuscles sense deep pressure and vibration
Created by: btuehara