Epithelial Tissue pt 1

Vocabulary flashcards covering epithelial tissue descriptions, functions, anatomical locations, histological specimen identification, and diagnostic classification rules.

Simple Squamous Epithelium structure

A tissue consisting of one layer of flat cells that is thin for diffusion

Simple Cuboidal Epithelium stucture

A tissue consisting of one layer of box-shaped cells functioning in secretion and absorption

Simple Columnar Epithelium structure

A tissue consisting of one layer of pillar-shaped cells functioning in the absorption and secretion of mucus

Transitional Epithelium structure

A stratified epithelium with a top layer that is sometimes squamous and sometimes dome-shaped, functioning to stretch easily

Stratified Cuboidal Epithelium structure

A tissue consisting of two or more layers of box-shaped cells

Stratified Squamous Epithelium structure

A tissue consisting of two or more layers of flat cells functioning in protection from abrasion

Stratified Columnar Epithelium structure

A tissue consisting of two or more layers of pillar-shaped cells

Pseudostratified Columnar Epithelium structure

A tissue consisting of column-shaped cells of varying heights with varying nuclei positions; functions to propel particles forward using cilia and secretes mucus

Specimen A

Identified as simple squamous epithelium with a simple layer of flattened apical cells; allows diffusion and is located in the alveoli of lungs and capillary walls.

Specimen B

Identified as simple cuboidal epithelium with a single layer of cuboidal cells surrounding a lumen; functions in secretion and absorption and is located in kidney tubules and the surface of ovaries.

Specimen C

Identified as pseudostratified columnar epithelium with columnar cells, cilia, and goblet cells; secretes substances and propels particles forward; located in the lining of the trachea and upper airway.

Specimen D

Identified as stratified squamous epithelium featuring flattened surface cells and cuboidal or columnar basal cells; protects from abrasion; located in the epidermis of skin and lining of esophagus.

Apical Surface Classification Rule

Epithelial tissue is classified by the shape of the cells at the apical surface rather than the basal surface because it faces the body surface where function takes place.

Pseudostratified Light Microscopy Features

Differing nuclei heights create the false appearance of multiple layers under a light microscope, while the presence of cilia at the surface distinguishes it from true stratified tissue.

simple squamous location

located in the lungs and blood vessels.

simple cuboidial location

located in the walls of glands and in the kidneys

simple columnar location

located lining the digestive tract.

transitional location

located in the urinary bladder, ureters, and urethra.

stratified cuboidial location

located in the ducts of sweat glands and mammary glands.

stratified squamous location

located in the skin, mouth, esophagus, and vagina.

stratified columnar location

located in the pharynx and male urethra

pseudostratified columnar location

located in the trachea and fallopian tubes (respiratory tract)