Tissues

1.    Simple Squamous Epithelium

Characteristics of simple squamous epithelial tissue:

This is a single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm. It allows passage of materials by diffusion and filtration where protection isn’t high priority and It also secretes lubricating substances in serosae.

Examples of simple squamous epithelial tissue:

Some examples are Kidney glomeruli, air sacs of lungs, lining of heart, blood vessels, and lymphatic vessels.

2. Simple Cuboidal Epithelium

Characteristics of simple cuboidal epithelial tissue:

It’s a single layer of cubelike cells with large, spherical central nuclei. The function is secretion and absorption.

Examples of simple cuboidal epithelial tissue:

Examples of this are kidney tubules, ducts and secretory portions of small glands, and ovary surface.

3.    Simple Columnar Epithelium

Characteristics of simple columnar epithelial tissue:

This is a single layer of tall cells with round to oval nuclei, some cells have cilia, and may contain goblet cells. The functions are absorption, secretion of mucus, enzymes and more; and probels mucus by ciliary action.

Examples of simple columnar epithelial tissue:

Examples are nonciliated type lines most of digestive things as stomach to anal canal, gallbladder, and excretory ducts; small bronchi, uterine tubes, and some regions of the uterus.

4. Pseudostratified Columnar Epithelium

Characteristics of pseudostratified columnar epithelial tissue:

It’s a single layer of cells of differing heights, some not high enough for the free surface, nuclei at different levels; and may have goblet cells and bear cilia. The functions are secretion, of mostly mucus and propulsion of mucus by ciliary action.

Examples of pseudostratified columnar epithelial tissue:

Examples are nonciliated type in male’s sperm carrying ducts and ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract.

5. Stratified Squamous Epithelium

Characteristics of stratified squamous epithelial tissues:

Thick membrane composed of several cell layers; basal cells (cuboidal or columnar), surface cells (flattened). The surface cells have keratin and dead and the basal produce cells of superficial layers. The functions are to protect underlying tissues in areas subjected to abrasion.

Examples of stratified squamous epithelial tissues:

They are found in nonkeratinized forms: the moist linings of the esophagus, mouth and vagina; and keratinized forms the epidermis of the skin and dry membrane.

6. Stratified Cuboidal Epithelium

Characteristics of stratified cuboidal epithelial tissues:

Usually two layers of cuboidal cells. Rare in the body

Examples of stratified cuboidal epithelial tissues:

They are found in the ducts of large glands (sweat glands, mammary glands)

7. Stratified Columnar Epithelium

Characteristics of stratified columnar epithelial tissue:

It occurs at transition areas or between two types of epithelia, and only its apical layer of cells are columnar. Also rare in the body

Examples of stratified columnar epithelial tissue:

They are found in the pharynx, male urethra, and lining some glandular ducts

8. Transitional Epithelium

Characteristics of transitional epithelial tissues:

It resembles both stratified squamous and cuboidal; basal are cuboidal or columnar and surface are dome shaped or squamouslike. Function is it stretches readily and permits distension of urinary organ by contained urine.

Examples of transitional epithelial tissues:

The examples are it lines the ureters, bladder, and part of the urethra