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There are two main sub-classifications of connective tissue. They are :- 1) connective tissue proper 2) specialized connective tissue. Connective

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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.Loose connective tissue

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

2.Dense connective tissue

Regular Irregular

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

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

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

Reticular Tissue

3.Adipose tissue

consists of :Adipocytes; "signet ring" appearing fat cells.

Function :

protects and insulates the

organs , and serves as an energy

reserve

Adipose tissue

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

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

Thank you