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4/30/2018 Difference Between Epithelial and Connective Tissue | Definition, Structure, Characteristics, Function
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Home » Science » Biology » Histology » Difference Between Epithelial and Connective Tissue
Difference Between Epithelial and Connective
Tissue
May 28, 2017 •by Lakna •6 min read
2
Main Difference – Epithelial vs
Connective tissue
Epithelial tissue, connective tissue, muscle tissue, and nervous
tissue are the four basic types of animal tissue. Both tissue
types consist of specialized cells and extracellular matrix. The
cells in the epithelial tissue are organized into one or more cell
layers. But, connective tissue is composed of more
extracellular fluid and cells in the tissue are scattered
throughout this matrix. The main difference between
epithelial and connective tissue is that epithelial tissue lines
the cavity and the surfaces of organs and blood vessels throughout the animal body whereas connective tissue
supports, connects and separates different types of tissues and organs in the body.
This article explains,
1. What is Epithelial Tissue
– Definition, Structure, Characteristics, Function
2. What is Connective Tissue
– Definition, Structure, Characteristics, Function
3. What is the difference between Epithelial and Connective Tissue
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What is Epithelial Tissue
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Epithelial tissue lines organs, vessels (blood and lymph), and cavities by forming a thin cell layer called endothelium
that is continuous with the inner tissue lining of the body. The free surface of the epithelium is exposed to air or fluids
while the bottom is attached to the basement membrane. The epithelial tissue acts as a barrier to microorganisms. The
epidermis that forms the skin protects the body from dehydration and damage. The epithelial tissue is also involved in
the secretion, absorption, and excretion. Enzymes and hormones are secreted by the epithelial cells in glands. The
intestinal epithelial cells absorb nutrients. Kidney epithelial cells excrete wastes. Epithelial cells in ear, nose, tongue
and skin have a sensory function. Ciliated epithelial cells in respiratory and reproductive tracts propel substances like
dust particles and female gametes respectively.
Classification of Epithelial Tissue
Three principal shapes of epithelial cells are found: squamous, columnar, and cuboidal. Squamous epithelial is flat
tile-like. Columnar epithelial cells are shaped like bricks, and cuboidal is dice-like. These cells are arranged in three
ways: simple, stratified, and pseudostratified. Simple epithelium contains a single layer of cells. Stratified epithelium
contains multiple layers of cells, and pseudostratified epithelium contains a single layer of cells of which the nuclei
are arranged in different levels. The classification of epithelial cells is shown in figure 1.
Figure 1: Classification of Epithelium
What is Connective Tissue
The connective tissue connects and supports other organs and tissues by filling space between them. It also provides
metabolic support to the organs and tissues. The cells and extracellular matrix make up the connective tissue. The
extracellular matrix is made up of fibrous proteins and glycoproteins which are attached to a basement membrane. The
composition of the extracellular matrix determines the properties of the connective tissue. A section of the epididymis
is shown in figure 2. The connective tissue is shown in blue. The supported epithelium by the connective tissue is
4/30/2018 Difference Between Epithelial and Connective Tissue | Definition, Structure, Characteristics, Function
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shown in purple color.
Figure 2: A section of epididymis, connective tissue (blue) and epithelium (purple)
Classification of Connective Tissue
Connective tissue is divided into connective tissue proper and specialized connective tissue. Connective tissue
proper is subdivided into loose, irregular connective tissue and dense irregular connective tissue. Loose, irregular
connective tissue consists of loosely arranged fibers with many cells. Lymph gland is an example of loose irregular
connective tissue, composing of plasma cells, finer elastin fibers, and thicker collagen fibers. Dense irregular
connective tissue contains a dense woven network of collagenous fibers in a viscous matrix. Dermis, muscle fascia,
and joint capsules contain dense irregular connective tissue. Cartilage, adipose tissue, hematopoietic tissue (bone
marrow and lymphoid tissue), blood, and bone are specialized connective tissue. The dense irregular connective
tissue in the skin is shown in figure 3.
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4/30/2018 Difference Between Epithelial and Connective Tissue | Definition, Structure, Characteristics, Function
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Figure 3: Dense irregular connective tissue in the skin
Difference Between Epithelial and Connective Tissue
Definition
Epithelial Tissue: Epithelial tissue line the cavity and surfaces of organs and blood vessels throughout the animal
body.
Connective Tissue: Connective tissue supports, connects and separates different types of tissues and organs in the
body.
Organization of Cells
Epithelial Tissue: Epithelial cells are closely packed together.
Connective Tissue: Connective tissue cells are scattered throughout an extracellular matrix.
Arrangement of Cells
Epithelial Tissue: Cells in the epithelial tissue are arranged either in single layers or multilayers.
Connective Tissue: Cells in the connective tissue are spread throughout the tissue.
Basement Membrane
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Epithelial Tissue: Epithelial tissue occurs above the basement membrane.
Connective Tissue: Connective tissue occurs below the basal membrane.
Development
Epithelial Tissue: Epithelial tissue is developed from ectoderm, endoderm, and mesoderm.
Connective Tissue: Connective tissue is developed from mesoderm.
Function
Epithelial Tissue: Epithelial tissue serves as a barrier over microorganisms and dehydration while secreting excreting
and absorbing substances.
Connective Tissue: Connective tissue supports and connects organs and tissues.
Blood Capillaries
Epithelial Tissue: No blood capillaries are found in the epithelial tissue.
Connective Tissue: Connective tissue is encompassed of blood capillaries which absorb nutrients.
Location
Epithelial Tissue: Epithelial tissue is found in the skin, glands, organs, mucous membranes, and organs like kidney
and lungs.
Connective Tissue: Connective tissue is found in adipose, bone, ligaments, tendons, nerves, cartilage and muscles.
Conclusion
Epithelial tissue and connective tissue are two basic types of tissues found in animals. Both tissues conjugate with
each other during functioning in the body. Epithelial tissue covers the animal body by forming a skin. It serves as a
protective barrier against microorganisms and dehydration. Some secretory, sensory, excretory functions are also done
by epithelial cells. Connective tissue supports other organs and tissues in the body. It absorbs nutrients from the blood
and makes them available to other cells in the extracellular matrix. Thus, the main difference between epithelial and
connective tissue is their function in the body.
Reference:
1. Bailey, Regina. “Why Epithelial Tissue Is Important.” ThoughtCo. N.p., n.d. Web. 24 May 2017.
<https://www.thoughtco.com/animal-anatomy-epithelial-tissue-373206>.
2. Paxton, Steve, Michelle Peckham, and Knibbs Adele. “Connective Tissue.” The Leeds Histology Guide. N.p., 01
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View all posts
About the Author: Lakna
Lakna, a graduate in Molecular Biology & Biochemistry, is a Molecular Biologist and has a
broad and keen interest in the discovery of nature related things
Jan. 1970. Web. 24 May 2017.
<http://www.histology.leeds.ac.uk/tissue_types/connective/connective_tissue_types.php>.
3. Bailey, Regina. “Blood and Other Types of Connective Tissue.” ThoughtCo. N.p., n.d. Web. 24 May 2017.
<https://www.thoughtco.com/connective-tissue-anatomy-373207>.
Image Courtesy:
1. “403 Epithelial Tissue” By OpenStax College – Anatomy & Physiology, Connexions Web site.
http://cnx.org/content/col11496/1.6/, Jun 19, 2013. (CC BY 3.0) via Commons Wikimedia
2. “Hist.Technik (2)” By Rollroboter – Own work (CC BY-SA 3.0) via Commons Wikimedia
3. ” By BruceBlaus – Own work, CC BY 3.0) via Commons Wikimedia
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