Types of Epithelial Tissue

Types of Epithelial Tissue and Their Locations

• Simple Squamous Epithelium

  • Composed of a single layer of flat cells.
  • Found in air sacs of the lungs for gas exchange.
  • Lines walls of capillaries, facilitating diffusion.
  • Covers blood and lymph vessels, aiding in smooth transport.

• Simple Cuboidal Epithelium

  • Made up of a single layer of cube-shaped cells.
  • Located on the surface of ovaries, playing a role in reproduction.
  • Lines kidney tubules, important for filtration and absorption.
  • Found in ducts and glands, facilitating secretion.

• Simple Columnar Epithelium

  • Consists of a single layer of tall, column-like cells.
  • Lines the uterus, supporting reproductive functions.
  • Covers the stomach for secretion and absorption.
  • Found in intestines, enhancing nutrient absorption.

• Pseudostratified Columnar Epithelium

  • Appears layered due to varying cell heights but is actually a single layer.
  • Lines respiratory passages, aiding in mucus secretion and ciliary movement to trap particles.

• Stratified Squamous Epithelium

  • Composed of multiple layers of cells, protecting underlying tissues.
  • Forms the outer layer of skin, providing a barrier against environmental damage.
  • Lines oral cavity, throat, vagina, and anal canal, offering protection against abrasion.

• Stratified Cuboidal Epithelium

  • Consists of two or more layers of cube-shaped cells.
  • Lines larger ducts of mammary glands, sweat glands, and salivary glands.
  • Found in pancreas, playing a role in secretion of digestive enzymes.

• Stratified Columnar Epithelium

  • Features multiple layers with columnar cells in the top layer.
  • Found in parts of the male urethra and the pharynx, contributing to protection and secretion.

• Transitional Epithelium

  • Specialized to stretch and recoil, consisting of several layers.
  • Inner lining of the urinary bladder, allowing accommodation of varying volumes of urine.
  • Lines ureters and part of the urethra, maintaining flexibility.

• Glandular Epithelium

  • Comprising cells that secrete substances, either endocrine or exocrine.
  • Includes salivary, sweat, and various endocrine glands, vital for regulation and homeostasis.