By: Steph , Lindsey, Kerri, Sam, Steffi, and Katie
Count the layers Simple: 1 layer Stratified: looks and is several layers Pseudostratified / Transitional: Looks like several layers, but all the cells contact the basement membrane What cell is on the top layer? Squamous: Flat (scaly) Cuboidal: about as wide as it is tall Columnar: much taller than it is wide
Singlelayer of thin squamous cells resting on a basement membrane Location: Air sac of lungs Forms the walls of capillaries Forms serous membranes Membranes that lines the ventral body cavity and cavity and covers the organs inside it
This shows singlelayers ofsquamous (flat)cells around theair spaces(alveoli) of thelung.
Location Common in glands and their ducts Forms walls of kidney tubules Covers surface of ovaries • A cluster of ducts in the pancreas • Top layer of the cell is as wide as it is thick
Location Line entire length of the digestive track from stomach to anus Located in digestive tract
Nonciliated type in male’s sperm-carrying ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract
1.Cilia2.Mucus of gobletcell3.Pseudostratifiedepithelium layer 4.(under three)Basementmembrane 5.(under four)connective tissue
Nonkeratinized type forms the moist linings of the esophagus and mouth; keratinized variety forms the epidermis of the skin, a dry membrane.
Little black dotsnuclei, mid-sectionstratified squamousepithelium, right belowthat basementmembrane, lastlyconnective tissue
Lines the ureters, bladder, and part of the urethra Top pinkish purple is the transitional epithelium, and then the lighter purple is the basement membrane, then connective tissue
pustuleStratified Squamous Epithelium Cross section of skin
• Inflammatory, chronically relapsing, non-contagious and itchy skin disorder• Type of eczema• Also known as "prurigo Besnier," "neurodermitis," "endogenous eczema," "flexural eczema," "infantile eczema," and "prurigo diathésique
Cause is genetic Aggravated by contact or intake of allergens Also influenced by other factors affecting the immune system Ex. stress and fatigue
Idiopathic- no certain cause Changes in at least 3 groups of genes encoding structural proteins, epidermal proteases and protease inhibitors may lead to a defective epidermal barrier
can’t keep in moisture can’t keep out irritants disturbs the formation of natural skin oils reduces sweat secretion skin can become so dry that it cracks and fissures develop allowing bacteria and irritants to penetrate the skin possibly cause infection