Name: stratified epithelium types and locations
Uploaded: 2025-05-22T09:05:55.000Z
Duration: 1 min 29 s
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K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.11

classification-of-epithelial-tissues-stratified-epithelium

Classification of Epithelial Tissues: Stratified Epithelium

The stratified epithelium is a multi-layered tissue covering exposed body surfaces.
Cells at the bottom layer continuously divide to replace the old, damaged cells that wear off from the exposed surface.
Stratified epithelia can be squamous..., cuboidal..., and columnar....
Squamous epithelia have flattened cells at the surface and cuboidal or columnar cells in deeper layers.
Squamous epithelia on the skin epidermis have anucleated surface cells densely packed with keratin filaments. Such keratinized epithelia make surfaces like the foot sole or palm&#160;sturdy and water-resistant.
Non-keratinized epithelia have nucleated surface cells containing less keratin. They line moist surfaces of the oral cavity, esophagus, and anus.
The cuboidal epithelia form the ducts of sweat and mammary glands, while the columnar epithelia line and protect specific areas of the pharynx and epiglottis.
Transitional epithelium is a specialized lining on organs like the urinary bladder. When the organ is stretched, the apical cells change their shape from cuboidal to squamous, allowing the epithelium to thin out. This transition enables the bladder to expand while storing urine.

classification of epithelial tissues: stratified epithelium

Stratified epithelium consists of several stacked layers of cells. They provide the durability to withstand constant physical and chemical attacks. Stratified epithelium is named after the shape of the most apical layer of cells. Stratified squamous epithelium is the most common type found in the human body. In this tissue, the apical cells are squamous, whereas the basal layer contains either columnar or cuboidal cells. The basal cells divide to form new daughter cells, which gradually become flattened while being pushed to replace the damaged cells wearing off from the top.
The top layer of some stratified squamous epithelia is called the keratinized epithelium and is covered with dead cells filled with keratin. Keratin provides toughness and a water-resistant property to this epithelium. This is why keratinized epithelia are found in exposed body surfaces like the skin.
In other cases, the top layer of flattened cells is not entirely filled with keratin and is called non-keratinized epithelium. This non-keratinized epithelia lines moist body surfaces, such as the esophagus, the vagina, parts of the anus, the floor of the oral cavity, and the dorsal part of the tongue.
Stratified cuboidal epithelium and stratified columnar epithelium are rare in the human body. Typically two layers of cuboidal cells are found lining the ducts of the sweat and mammary glands. In stratified columnar epithelium, superficial cells are columnar and help protect some portions of the pharynx, the epiglottis, the anus, and the glandular ducts.
A special kind of stratified epithelium is the transitional epithelium, or the urothelium, named for the shape change that occurs in the apical cells as the bladder fills with urine. It is found only in the urinary system, specifically in the ureter and the urinary bladder. When the bladder is empty, this epithelium has cuboidal apical cells with convex, umbrella-shaped apical surfaces. As the bladder fills with urine, this epithelium loses its convolutions and the apical cells transition from cuboidal-shaped to squamous-shaped. Thus, the urothelium appears thicker and more multi-layered when the bladder is empty but more stretched out and less stratified when it is full and distended.

Reference:
This text is adapted from<a href="https://openstax.org/books/anatomy-and-physiology/pages/4-2-epithelial-tissue"> Openstax, Anatomy and Physiology 2e, Section 4.2: Epithelial Tissues</a>

Stratified epithelium consists of several stacked layers of cells. They provide the durability to withstand constant physical and chemical attacks. ...

Education

JoVE Core

Anatomy and Physiology

Unit 1

Tissues of the Human Body

KEY TERMS AND CONCEPTS

stratified epithelium types and locations

Stratified epithelium is made of several stacked layers of cells. These layers add durability and help the tissue handle constant physical and chemical stress. The tissue is named by the shape of the most apical, or top, cell layer.

Stratified squamous epithelium is the most common type in the human body. Its apical cells are squamous, while the basal layer contains cuboidal or columnar cells. Basal cells divide to make new daughter cells. As these new cells move upward, they become flatter and replace cells that wear away from the surface.

Some stratified squamous epithelium is keratinized epithelium. Its top layer contains dead cells filled with keratin, a protein that adds toughness and water resistance. This type is found on exposed body surfaces such as the skin. Other stratified squamous epithelium is non-keratinized. It lines moist surfaces like the esophagus, vagina, parts of the anus, the floor of the oral cavity, and the dorsal part of the tongue.

Stratified cuboidal epithelium and stratified columnar epithelium are rare in humans. Stratified cuboidal epithelium usually has two layers of cuboidal cells and lines the ducts of the sweat and mammary glands. In stratified columnar epithelium, the superficial cells are columnar. It helps protect parts of the pharynx, the epiglottis, the anus, and glandular ducts.

Transitional epithelium, also called urothelium, is a special stratified epithelium. It changes shape as the bladder fills with urine. It is found only in the urinary system, in the ureter and urinary bladder. When the bladder is empty, the apical cells are cuboidal with convex, umbrella-shaped tops. As the bladder fills, the tissue loses its folds and the cells shift toward a squamous shape. The urothelium then looks thicker and more layered when empty, but more stretched and less stratified when full and distended.

Stratified Epithelium Types and Locations

stratified-epithelium-types-and-locations

tissues

Four Tissue Types in the Human Body

Tissues are groups of cells with a common embryonic origin. Under a microscope, the cells in a tissue often look similar and are arranged in an orderly pattern. This structure helps the tissue carry out a specific function. In the human body, many different cells are organized into four broad tissue categories: epithelial, connective, muscle, and nervous. These tissue types each have a distinct role in keeping the body working properly. They also show how cells can be specialized for different...

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cell adhesion molecules - types and functions

cell-adhesion-molecules-types-and-functions

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classification of epithelial tissues: overview

classification-of-epithelial-tissues-overview

Epithelial Tissue Shapes and Layers

Epithelial tissue is identified by cell shape and by the number of cell layers. The main cell shapes are squamous, cuboidal, and columnar. Squamous cells are flattened and thin. Cuboidal cells are square-like, and columnar cells are rectangular and taller than they are wide. The nucleus shape also helps with identification. Squamous cells have flattened, disc-shaped nuclei. Cuboidal cells have spherical nuclei. Columnar cells have elongated nuclei. Epithelial tissue is also grouped as simple...

classification of epithelial tissues: simple epithelium

classification-of-epithelial-tissues-simple-epithelium

Simple Epithelium: Types and Cell Shapes

Simple epithelium is a single layer of cells that lines body cavities and blood vessels. The shape of each cell matches the job of the tissue. In the body, this means flat, box-like, and tall cells each help in different ways. Simple squamous epithelium is made of thin, scale-like cells with flat, elliptical nuclei. Because these cells are so thin, they are found where chemicals must pass quickly. This tissue lines capillaries and blood and lymph vessels as endothelium, where nutrients are...

Stratified epithelium is made of several stacked layers of cells. These layers add durability and help the tissue handle constant physical and chemical stress. The tissue is named by the shape of the most apical, or top, cell layer. Stratified squamous epithelium is the most common type in the human body. Its apical cells are squamous, while the basal layer contains cuboidal or columnar cells. Basal cells divide to make new daughter cells. As these new cells move upward, they become flatter...

classification of epithelial tissues: glandular epithelium

classification-of-epithelial-tissues-glandular-epithelium

Glandular Epithelium: Secretory Cell Types

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exocrine glands: unicellular and multicellular glands

exocrine-glands-unicellular-and-multicellular-glands

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Exocrine Glands and Their Secretion Types

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exocrine glands: types of secretions

Exocrine Gland Secretions and Examples

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Connective Tissue Structure and Disorders

Connective tissue is one of the four main tissue types in the human body. It is found throughout the body and helps connect and support different tissues. Its cells sit inside an extracellular matrix, or ECM, which includes a ground substance and protein fibers. The ECM gives connective tissue its different forms and strengths. The ground substance can be watery, jelly-like, or even mineralized and hard. The main protein fibers are collagen fibers, elastic fibers, and reticular fibers.

functions of connective tissues

How Connective Tissues Support the Body

Connective tissues support, connect, and protect the body. They also act as packing material between tissues in many organs. Different connective tissues do these jobs in different ways. Areolar tissue is a connective tissue prototype. It commonly cements different tissue types together in diverse body organs. Adipose tissue cushions internal organs and helps insulate the body from heat loss. Hard connective tissues include bones and cartilage. These tissues provide structure and support.

classification of connective tissues

Connective Tissue Types and Functions

Connective tissues support, connect, and protect body structures. They are grouped into proper, supporting, and fluid connective tissues. Each group has its own cell types, fibers, and matrix features that help it do a specific job. Connective tissue proper is the most abundant type. It mainly joins different tissues in the body. This group is further divided into loose and dense connective tissue based on the cell types, ground substance, viscosity, and fiber types in the extracellular...

embryonic connective tissues

Embryonic Support Tissues in Development

Embryonic connective tissues help shape the body during early development. The main types are mesenchyme and mucoid connective tissue. Both are temporary tissues that appear before birth and help build later structures. Mesenchyme is the first connective tissue to appear in the developing embryo. It is made of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose structure lets cells move easily, which is important for germ layer...

overview of connective tissues proper

Loose and Dense Connective Tissue Types

Connective tissue proper includes the mature connective tissues in the body, except bone, cartilage, blood, and lymph. It is divided into two main subclasses: loose connective tissue and dense connective tissue. These groups are classified by how their protein fibers are arranged and by the amount of ground substance, which is the material that fills the space between cells. Loose connective tissues contain a meshwork of thin collagen and elastin fibers. This arrangement gives support, tensile...

extracellular matrix

Extracellular Matrix in Connective Tissue

The extracellular matrix (ECM) gives connective tissue its support, shape, and signals. Unlike epithelial tissue, where cells are tightly packed with little or no space between them, connective tissue cells are spread out in a matrix. That matrix fills the space around the cells and helps the tissue work as a unit. The ECM contains fibrous proteins such as collagen, elastin, and fibronectin. It also includes a ground substance made of interstitial fluid, cell adhesion proteins, and...

connective tissue fibers and ground substance

connective-tissue-fibers-and-ground-substance

How Connective Tissue Gets Its Strength

Connective tissue gets its strength and support from cells, ground substance, and protein fibers. Unlike epithelial tissue, which has tightly packed cells, connective tissue cells are spread out in a matrix. The matrix is the extra material outside the cells, and it is made by the connective tissue cells themselves. It is a major part of how this tissue works. The main part of the matrix is ground substance, which is often a fluid but can also be hard and mineralized, as in bone. Connective...

loose connective tissue

Loose Connective Tissue Types and Functions

Loose connective tissue is found between many organs. It helps bind tissues together and absorb shock. It also lets water, salts, and nutrients diffuse into cells that are embedded in it or in nearby tissues. Adipose tissue is a type of loose connective tissue made mainly of fat storage cells called adipocytes. It has very little extracellular matrix, and its many capillaries help move lipid molecules quickly. White adipose tissue is the most common type in adults. It can look yellow because...

dense connective tissue

Dense Connective Tissue Fibers and Support

Dense connective tissue has more collagen fibers than loose connective tissue. That extra collagen makes it more resistant to stretching. It is usually grouped into two main types: dense regular connective tissue and dense irregular connective tissue. Dense regular connective tissue has fibers arranged in parallel. This pattern gives the tissue high tensile strength, or resistance to pulling, in the direction of the fibers. Ligaments and tendons are made of dense regular connective tissue, and...

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Fascia and Body Movement Support

Fascia is a thin, fibrous connective tissue that supports many parts of the body. It surrounds skeletal muscles, bones, blood vessels, and organs. Because it forms a continuous layer, it helps define and protect these structures. There are three main types of fascia: superficial fascia, deep fascia, and subserous fascia. Each type lies at a different depth in the body. Together, they make up a fascial system that links tissues across the body. Fascia reduces friction so muscles, joints, and...

bone as supporting connective tissue

Bone Matrix and Cell Structure

Bone tissue is the hard connective tissue that forms the internal skeleton of vertebrate animals. It gives the body support and shape. Bone, also called osseous tissue, contains a matrix made of both organic and inorganic material. The organic matrix includes collagen and elastic fibers. These materials help give bone strength and flexibility. The inorganic matrix is made mostly of mineral salts, especially calcium salts. These salts make bone hard. If the organic material is too low, bones...

tissue membranes

Tissue Membranes and Their Functions

Tissue membranes are thin layers that cover the body, protect organs, line passageways that open to the outside, and line movable joint cavities. They fall into two broad groups: connective tissue membranes and epithelial membranes. Connective tissue membranes are made only of connective tissue. They wrap around organs such as the kidneys and also line movable joints. A synovial membrane is a connective tissue membrane found in freely movable joints like the shoulder, elbow, and knee. Inside...

fluid connective tissues: blood and lymph

Blood and Lymph: Transport and Defense

Blood and lymph are fluid connective tissues that help the body transport materials and defend against infection. They contain formed elements, which are cells suspended in a liquid extracellular matrix called plasma. These formed elements come from hematopoietic stem cells in the bone marrow. Blood moves through arteries, capillaries, and veins. Its plasma is made mainly of proteins, solutes, and water. The rest of the blood includes erythrocytes, or red blood cells, leukocytes, or white...

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Tissue Injury and Wound Healing

Tissue injury triggers inflammation and repair. After tissue is damaged, the body begins a wound healing response that helps protect the area and restore function. Inflammation is the first stage. It helps limit further damage and prepares the tissue for repair. During this time, the body clears injured material and starts the healing process. Repair follows as new tissue forms. In some cases, the damaged area can be replaced by tissue that restores normal structure and function. In other...

the effect of aging on tissues

How Aging Changes Body Tissues

Aging changes body tissues and lowers how well many body systems work. Some of the clearest changes are visible on the outside. Skin can become dry, thinner, and less elastic, which leads to wrinkles. The skin on the face may also look looser because connective tissue has less elastic and collagen fibers. Aging also affects hair, senses, bones, and joints. Melanin production in hair follicles decreases with age, so hair can turn gray. Sight and hearing may decline, and glasses or hearing aids...

key terms and concepts

Learn how stratified epithelium protects body surfaces, where squamous, cuboidal, columnar, and transitional types are found, and how urothelium changes with bladder fill.

Stratified Epithelium Types and Locations | JoVE K12

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Stratified Epithelium Types and Locations

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