Post on 19-Jan-2018
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Ch 4: Types of Connective tissue
Descriptive HistologyCLS 222 Saida Almashharawi
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To know the classification of connective tissue& it is categories
Objectives
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There are two main sub-classes of connective tissue :-
1) Connective tissue proper
2) Specialized connective tissue.
Classification of connective tissue
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Connective tissue proper is subdivided further into Loose (or sometimes referred to as areolar) Dense: this is subdivided to
o Regular
o Irregular
Connective tissue proper
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Specialized connective tissue is further subdivided into :Adipose connective tissueReticular connective tissueElastic connective tissueCartilage Supportive connective tissueBoneBlood Fluid connective tissuelymph
Classification of connective tissue
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1.Loose connective tissue
is characterized by small interwoven collagen fibers embedded in more ground substance than in dense connective tissue.
Fewer and smaller collagen fibers compared with dense connective tissue.
The fibroblast is the main cell that produces and maintains the ground substance and collagen fibers.
Connective tissue proper
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Loose connective tissue
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Location:
1) Around small blood and lymphatic vessels
2) Fills the spaces between muscle and nerve fibers.
3) Mucous membranes
4) Glands
Loose connective tissue
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Structure: Has all the main components of connective tissue (cells, fibers, and ground substance) Cells:
1) Fibroblasts
2) Macrophages,
3) Other types of connective tissue cells are also
present.
Loose connective tissue
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Fibers:1) Collagen
2) Elastic
3) Reticular
Ground substances:4) Flexible
5) Well vascularized
6) Not very resistant to stress.
Loose connective tissue
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2.Dense connective tissue
1) It has the same components found in loose
connective tissue, but there are fewer cells& more
fibers
2) Dense connective tissue is less flexible and more
resistant to stress than loose connective tissue.
Connective tissue proper
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2.Dense connective tissue
Regular Irregular
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1. collagen fibers are arranged in bundles
2. collagen fibers form a 3-dimensional network
providing resistance to stress from all directions.
Dense irregular connective tissue
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LOCATION:• Deep fascia (thin sheath of fibrous tissue
enclosing a muscle or other organ)
• Dermis of skin
• Joint capsules
• Heart valves
Dense irregular connective tissue
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Dense irregular connective tissue
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1. The collagen bundles of dense regular connective tissue are arranged according to a definite pattern,
2. This arrangement offers great resistance to traction forces.
Location: forms tendons & ligaments
Dense regular connective tissue
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Dense regular connective tissue
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Consists of reticular fibers and reticular cellReticular fibers are very small, on the order of 1
micron in diameter. They are made up of type III collagen (collagen
fibers are made up of type I collagen).Reticular fibers cannot be visualized in specimens
stained with Hematoxylin-Eosin mainly because they are so small and contain so little collagen protein.Found in :
• Liver• spleen • lymph nodes
Reticular connective tissue
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Reticular tissue
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consists of :Adipocytes; appearing fat cells.
Function :
1. protects and insulates the
organs
2. serves as an energy reserve
Adipose tissue
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Adipose tissue
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LOCATION
• Hypodermis
• Around the Kidneys& Eyeballs
• Female breasts
• Abdominal region
Adipose tissue
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adipose tissue represents 15–20% of the body weight
in men of normal weight
in women of normal weight, 20–25% of body weight.
Adipose tissue
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composed of:• Branching elastic fibers
• Network of collagen fibers
• Fibroblasts Location:
• Dermis
• Lungs
• Blood vessels
Elastic tissue
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Elastic tissue
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What kind of tissue does this represent?
Loose (areolar) connective tissue
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What kind of tissue does this represent?
Where in the body can you find this tissue?
Adipose tissue
fat
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What kind of tissue does this represent?
Where in the body can you find this tissue?
Dense connective tissue
tendons; ligaments
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