Epithelium: classification by layers

Epithelium: classification by layers

1. Simple: 1 cell layer thick

   • Squamous: thin,flat, irregular fish-scale shaped
   • Cubodial: square
   • Columnar: rectangular (higher than wider)
   • Transitional: basal layers cuboidal or columnar, surface layers often squamous

2. Stratified: more than 1 layer

   • Squamous: thin, fish-scale shaped
     • Keratinized : epidermis in skin
     • Nonkeratinized: lines wet cavities ( mouth, esophagus, vagina, surface layer of living cells (retain nucleii) NOCRNEAL EPITHELUM
   • Cuboidial: Square
   • Columnar: rectangular( higher than wider)
   • Transitional: basal layers cuboidal or columnar, surface layers often squamous

3. Pseudostratified: appears stratified, but all cells touch the basement membrane

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