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There are two main sub-classifications of connective
tissue.
They are :-
1) connective tissue proper
2) specialized connective tissue. Connective tissue proper is subdivided further into loose (or sometimes referred to as areolar) dense.
Classification of Connective tissue
1.Connective tissue properThere are two general classes of connective tissue proper:
1. Loose
2. Dense :
o Regular
o Irregular
Classification of Connective tissue Specialized connective tissue is further subdivided into :Adipose connective tissueReticular connective tissueElastic connective tissueCartilagebone supportive connective tissueBlood fluid connective tissue
1.Connective tissue proper1.Loose connective tissue:
is characterized by smaller interwoven collagen fibers embedded in more ground substance than in dense connective tissue.
The fibroblast is the main cell that produces and maintains the ground substance and collagen fibers.
Fewer and smaller collagen fibers compared with dense
1.Connective tissue properLocation:
1) Around small blood and lymphatic vessels
2) Fills the spaces between muscle and nerve fibers.
3) Mucous membranes
4) Glands
1.Connective tissue properStructure: 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.
1.Connective tissue properFibers:
1) Collagen
2) elastic
3) Reticular
Ground substances:
4) flexible
5) well vascularized
6) Not very resistant to stress.
2.Dense connective tissue
1) It has the same components found in loose
connective tissue, but there are fewer cells
2) Dense connective tissue is less flexible and more
resistant to stress than loose connective tissue.
1.Connective tissue proper
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
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
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
2.Reticular TissueConsists 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
3.Adipose tissue
consists of :Adipocytes; "signet ring" appearing fat cells.
Function :
protects and insulates the
organs , and serves as an energy
reserve
3.Adipose tissueLOCATION
• Hypodermis
• Around the Kidneys& Eyeballs
• Female breasts
• Abdominal region
3.Adipose tissue
adipose tissue represents 15–20% of the body weight
in men of normal weight
in women of normal weight, 20–25% of body weight.
composed of:
• branching elastic fibers
• network of collagen fibers
• fibroblasts Location:
• dermis
• lungs
• blood vessels
4. Elastic tissue
What kind of tissue does this represent?
Where in the body can you find this tissue?
delicate thin layers between tissues; present in all mucous
membranes
Loose (areolar) connective tissue
What kind of tissue does this represent?
Where in the body can you find this tissue?
Adipose tissue
fat
What kind of tissue does this represent?
Where in the body can you find this tissue?
Dense connective tissue
tendons; ligaments