Connective Tissue



Connective tissue proper includes loose CT, dense CT, adipose tissue and reticular tissue.



Loose CT is composed of cells, fibers and ground substance.

fibrocyte

fibroblast

Fig 1 Fibroblast and Fibrocyte(TEM)

Fig 2 Macrophage(Spread preparation of loose connective tissue,special

erythrocyte

erythrocyt e

Macrophag e

Fig 3

Macrophage(SEM)

rough endoplasmic reticulum ， RER

Nucleus

Fig 4 Plasma cell(TEM)

Fig 5 Mast cell(special stain,high

Nucleus

membrane-enwrapped granule

Fig 6

Mast cell(TEM)

Elastic fiber

Collagenou s fiber

Fig 7 Spread preparation of loose connective tissue

Reticular fiber Reticula r fiber

Reticular fiber

Fig 8 Section of lymph node.showing reticular fiber(silver stain ,high mag.)

LCT

Stratified squamous epitheliu m

Blood vessel

Fig 9

Section of loose connective tissue(HE stain,low mag.)

fibers

Nucleus of fibroblast

Blood vessel

Fig 10 Section of loose connective tissue(HE stain,high mag.)

①

② ③

Fig11 Finger skin(HE stain) ① epidermis ②dermis③hypodermis

fibers

Fig 12 Section of irregular dense connective tissue(HE stain,high

Tendon cell

Collagen fiber

Fig 13

Section of regular dense connective tissue---Tendon (HE stain,high mag.)

Connectiv e tissue

Fat cell

Fig 14 Section of Adipose tissue,showing fat cell (HE stain,high mag.)

Reticular cell

Reticular cell

Fig 15 Section of lymph node,showing reticular tissue (HE stain ,high mag.)

macrophag e

lymphocyte Reticular cell

Fig 16 Section of lymph node,showing reticular tissue (HE stain ,high mag.)

No.2 spread preparation of connective tissue (special stain, showing collagen fibers and elastic fiber) No.4 spread preparation of connective tissue (special stain, showing macrophages) No.5 spread preparation of connective tissue (special stain, showing mast cells) No.32 skin (HE, showing keratinized stratified squamous epithelium , dense irregular CT and adipose tissue) No. 28Lymph nodes (HE, showing reticular tissue, reticular cells) No.3 Lymph nodes (Silver stain, showing reticular fibers) No. 37 Esophagus (HE, showing non-keratinized stratified squamous epithelium and loose CT )

Drawing 1.Mast cells 2.Macrophages 3.Reticular cells 4.Adipose cells

Questions for review 1.How many types of tissue does the connective tissue include? 2.What components does the loose connective tissue contain? 3.Describe the structure and function of macrophage, fibroblast, plasma cell and mast cell. 4.Describe the differences of structure and function between the yellow adipose tissue and brown adipose tissue. 5.Take the degranulation of mast cell as an example, describe the relationship between the structure and function.