Descriptive Histology CLS 222 Saida Almashharawi 1

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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 3

 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 4

 Specialized connective tissue is further subdivided into :  Adipose connective tissue  Reticular connective tissue  Elastic connective tissue  Cartilage Supportive connective tissue  Bone  Blood Fluid connective tissue  lymph Classification of connective tissue 5

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 6

Loose connective tissue 7

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Fibers: 1)Collagen 2) Elastic 3)Reticular Ground substances: 1)Flexible 2) Well vascularized 3)Not very resistant to stress. Loose connective tissue 10

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 11

2.Dense connective tissue Regular Irregular 12

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 13

Dense irregular connective tissue 14

Dense irregular connective tissue 15

Dense regular connective tissue 16

Dense regular connective tissue 17

Reticular connective tissue 18

Reticular tissue 19

Adipose tissue 20

Adipose tissue 21

Adipose tissue 22

 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 23

Elastic tissue 24

Elastic tissue 25

What kind of tissue does this represent? Loose (areolar) connective tissue 26

What kind of tissue does this represent? Where in the body can you find this tissue? Adipose tissue fat 27

What kind of tissue does this represent? Where in the body can you find this tissue? Dense connective tissue tendons; ligaments 28

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