Tissues B L A K E

Tissues

By Blake Allen

Epithelial Tissue Connective Tissue

Epithelial Tissues

Simple Epithelial- Made up entirely of single cell layers

Stratified Epithelial- consists of two or more layers of cells

Credits Simple Epithelial Stratified Epithelial

Simple Squamous EpitheliumFound in the Kidneys and in the lungs.

The purpose is diffusion or filtration.

There are two main types.

Endothelium, provides a friction free surface , found mostly in the cardiovascular system.

Mesothelium, found in serous membranes that line the ventral body cavity.

Stratified EpithelialPsuedostratified Columnar Epithelial- These cells vary in height so only the taller cells reach the free surface.

Stratified Squamous Epithelium- Several layers of pancake like cells.

Stratified Cuboidal and Columnar Epithelium- Very rare in the ,made of two layers, found mostly in the ducts of larger glands such as sweat glands and mammary glands.

Psuedostratified Columnar Stratified Cuboidal and Columnar Stratified Squamous

Psuedostratified Columnar Epithelium

These cells vary noticeably in height.

All of the cells are planted on a common ground substance, however only the tallest reach the open area.

This really is not stratified the word psuedo means false, so it gives the appearance of being stratified but it isn’t.

This epithelium secretes or absorbs substances and can be found mainly in the respiratory tract.

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Simple Epithelial

Simple Squamous Epithelium- Only one very thin layer of flattened cells.

Simple Cuboidal Epithelium- One layer of cube shaped cells that are just as tall as they are wide.

Simple Columnar Epithelium- One layer of tall skinny cells packed closely together.

Home Simple Squamous Simple Cuboidal Simple Columnar

Simple Cuboidal Epithelium

Made up of one layer of cells that are equally wide as they are tall.

This tissue’s function is also secretion and absorption

Found mainly on the walls of small ducts and glands and kidney tubules.

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CreditsPictures courtesy of Blake Allen from Flickr.com

Stratified Cuboidal and Columnar EpitheliumThese tissue types cannot be found in many places.

Stratified cuboidal are mostly in ducts and larger glands.

Usually only two layers of cube shaped cells.

Stratified columnar can be found in the pharynx, male urethre, and some glandular ducts.

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Stratified Squamous EpitheliumThe most abundant type of epithelial tissue in the body.

Made of several layers of pancake shaped cells.

Found in areas that are subject to a lot of wear and tear.

This is the epithelial tissue that makes up the outer portion of the skin.

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Simple Columnar EpitheliumA single layer of tall tightly packed cells.

Main purpose is secretion and absorption.

Found in the digestive tract.

There are two main parts, dense microvilli that absorb, and goblet sells that secrete.

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Connective Tissue There are four main classes of connective

tissues.

Connective tissue proper, Cartilage, Bone Tissue, and blood.

Connective tissue does more than just connect things together it is used for transportation, protection,m insulation, and binding and support.

Credits Proper Tissue Cartilage

Bone Tissue Blood

Connective Tissue Proper

There are two classes of connective tissue proper.

Loose Connective Tissues

Dense Connective Tissues

Loose Connective Tissue Dense Connective Tissue

Cartilage

Cartilage can stand up to both tension and compression.

Cartilage is avascular and contains no nerve fibers.

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Bone Tissue

Also known as Osseous Tissue, the main purpose is to support and protect body organs.

Bone tissue is very similar to cartilage however it is much stronger and more brittle, due to an added calcium salt.

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Blood

The fluid within blood is also considered connective tissue even though it does not connect anything it is classified as such because it developed from mesenchyme.

This is called blood plasma.

The main purpose is transportation.

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Loose Connective Tissue

Loose Connective Tissue consists of three main types.

Areolar

Adipose

Reticular

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Dense Irregular Connective Tissue

Has almost identical struucture to regular dense connective tissue.

Dense Irregular connective tissue produce a kind of web in the body.

Found in the skin and in fibrous caps on joints.

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Dense Connective Tissue

There are two types of dense connective tissue.

Dense regular connective tissue.

Dense irregular connective tissue.

Home Dense Regular Dense Irregular

Dense Regular Connective Tissue

Made mostly of fibers, also referred to as fibrous connective tissue.

Made up of tightly packed bundles of collagen fibers, that run in the same direction.

Mostly found in tendons and in a few ligaments.

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