connective varieties-lp.ppt

8/10/2019 connective varieties-lp.ppt

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Connective tissue

varieties


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1.Connective tissue proper:

a) loose

b) dense: - irregular

- regular- elastic

2.Connective tissues with special functions:

a) reticular: - myeloid- lymphoid

b) adipose: - white

- brown

c) mucos

d) blood

3. skeletal conjunctive tissues:- cartillage

- bone


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Dense irregular connective tissue

Predominanceof collagenfibersin

bundles disposed in all directions

Rare reticular and elastic fibers

Small amounts of ground substance

Cells : fibroblasts, fibrocytes, plasmacells, macrophages, mast cells,

leukocytes


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Dense Irregular Connective

Tissue

Location:

capsules of the parenchimatose organs,

dermis

submucosa of the digestive tract

periosteum, perichondrium dura mater

epinerve, epitenonium, epimisium


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Dense irregular connective tissue - dermis HE


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Tesut conjunctiv dens semiordonat

Dense irregular connective tissue HE ob. 40X


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Dense regular connective tissue -

Aponeurosis

assures insertion of flat muscles on bone

inextensible structuremade of 2 or more

overlapped connective layers predominance of collagen fibers parallel in

the same layer and perpendicular to theones in the layers above and beneath textile aspect

small amounts of ground substance

cells : fibroblasts, fibrocytes


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Aponeurosis- HE


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Dense regular connective tissue

Tendon (I)

Inextensible structure,assuring insertion of

long muscles on bone

Longitudinal section : Parallel bundles of collagen and elastic fibers

Ground substance and cellsamong the

fibers tenocytescells with wing-like processes

disposed in twin pairs


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Tendon longitudinal section- HE ob. 20X, 40X


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Dense regular connective tissue

Tendon (II)

Transvers section:

primary tendonoval or round shape

wing-like processes ensheath thecollagen fibers greater resistance

primary tendon endotenonium

secondary tendon peritenonium

entire tendon epitenonium


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Primary tendon

Collagen fibers

Collagen fib


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Tendon transverse sectionHE, 40X


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Elastic Tissue

Location:yellow ligaments of the spinalcord and in the suspensory ligaments of

the penis

Predominance of elastic fibers, in a

parallel array

Fibroblasts


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Reticular tissue

Location: framework (stroma) of the

myeloid (bone marrow) and lymphoid

tissue (lymph nodes, spleen) duble meshwork:

reticular cellswith thin processes

a fine network of branched reticular fibers

Ground substance


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Limph nodesilver impregnation + HE


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Reticular tissue

Reticular cells:

mesenchymal originacidophilic cytoplam with long processes

round, euchromatic nucleus

gap junctions between neighborprocesses


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White (unilocular) adipose tissue Locationsubcutaneous adipose tissue

Predominance of cellswhite adipocytes Small amounts of ground substance and fibers,

mainly reticular

White adipocyte : mesenchymal origin

100-120 m

signet ring aspectperipheric cytoplasm and nucleus

single lipid droplet

acidophilic cytoplasm

elongated, heterochromatic nucleus


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White adipose tissue HE, 40 X


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Adipose tissue,Sudan III, ob 40 X


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Brown (multilocular) adipose tissue

Location: retrosternal, inghinal region, cervical,subscapulary, profound mediastinum

Thermogenesis

Predominance of cells brown adipocytes

Small amounts of ground substance and fibers,mainly reticular

connective tissue lobules, better delineatedthan in unilocular adipose tissue

brown adipocyte: poligonal cell, 45-60 m

central nucleus

Numerous lipid droplets of different sizes


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Brown adipose tissue- azan


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Mucous tissue

Location: the principal component of the

umbilical cordWhartons jelly; in the pulp of

young teeth

Abundance of amorphous ground substance

Jelly-like tissue

Very few fibers, mainly reticular

Mesenchymal cells, fibroblasts


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Mesenchymal cell

Undifferentiated cell in embrionaryconnective tissue, capable of differentiating

in all types of cells found in adult

connective tissue Star-like, irregular shape, with branched

cell processes

Basophilic cytoplasm

Oval nuclei with dispersed chromatin and

evident nucleolus


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connective varieties-lp.ppt