Anatomy 3601: Lecture 3
Anatomy 3601: Lecture 3 FSCN 1112
U of M
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This 2 page Class Notes was uploaded by alliemartinnn Notetaker on Thursday January 28, 2016. The Class Notes belongs to FSCN 1112 at University of Minnesota taught by Mashek, Douglas in Summer 2015. Since its upload, it has received 26 views. For similar materials see Principles of Nutrition in Nutrition and Food Sciences at University of Minnesota.
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Date Created: 01/28/16
Membranes and the Skin Membranes ● Membrane= epithelium + connective tissue ● Types: ○ Cutaneous → true epithelium + dermis ○ Mucous → true epithelium + lamina propria ○ Serous → mesothelia + lamina propria ○ Endothelial → endothelia + lamina propria ○ Synovial → endothelia + lamina propria ● Fascia= a mix of connective tissues ○ Superficial (areolar, adipose, hypodermis) ○ Deep (dense CT) ○ Skin (epidermis, stratified squamous, dense CT) *skin → superficial fascia → deep fascia → muscle* Skin ● Function ○ Protection ○ Water retention ■ Insensible Perspiration= constant small loss of water through the skin ○ Temperature regulation ■ Vasodilation= dilation of artery to release heat ■ Vasoconstriction= constriction of artery to retain heat ○ Metabolic regulation ○ Immune defense ■ Langerhans Cells= Dendritic cells; phagocytes in the epidermis that alert immune system to invaders or infection ○ Excretion ○ Sensory information collection ● Integument= epidermis + dermis ● Nerve endings ○ Merkel Corpuscle → touch ○ Free Nerve Endings → pain ○ Meissner’s Corpuscle → light pressure ○ Pacinian Corpuscle → deep pressure ○ Ruffini Corpuscle → temperature ● Types of Skin ○ Thick Skin= extra layer of epidermis (Stratum Lucidum), no hair follicles or sebaceous glands ○ Think Skin= covers most of the body; has hair follicles and sebaceous glands ● Layers of the Epidermis (most inferior to most superior) 1. Stratum Basale (basal layer) ■ single layer, tightly attached to basement membrane ■ Contains keratinocyte cells, melanocytes, Merkel’s corpuscles 2. Stratum Spinosum (spiny cell layer) ■ several layers ■ mature keratinocytes bind together to make desmosomes 3. Stratum Granulosum (granular layer) ■ several layers ■ Keratohyalin and Lamellar granules; keratinization begins here 4. Stratum Lucidum (clear layer) *****thick skin only ■ Several layers ■ Cells appear empty 5. Stratum Corneum (horny layer) ■ 20 layers, the most superficial layer ■ tightly packed dead cells ● The Dermis ○ Two layers: 1. Papillary ● areolar connective tissue ● dermal papillae ● capillaries, free nerve endings 2. Reticular ● Dense irregular connective tissue ● heavy collagen, connects to hypodermis
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