Connective tissue proper loose connective tissue

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Connective tissue proper: loose connective tissue, adiposeDescription:Matrix as in areolar,but very sparse; closely packedadipocytes, or fat cells, havenucleus pushed to the side bylarge fat droplet.Photomicrograph:Adipose tissue fromthe subcutaneous layer under the skin (350x).Nucleus ofadipose(fat) cellFunction:Provides reserve foodfuel; insulates against heat loss;supports and protects organs.Location:Under skin insubcutaneous tissue; aroundkidneys and eyeballs; withinabdomen; in breasts.Fat dropletAdiposetissueMammaryglandsFigure 4.8bConnective tissues.
Reticular Connective TissueResembles areolar but fibers are reticular fibersFibroblasts calledreticular cellsSupports free blood cells in lymph nodes, thespleen, and bone marrow
Connective tissue proper: loose connective tissue, reticularDescription:Network of reticularfibers in a typical loose groundsubstance; reticular cells lie onthe network.Photomicrograph:Dark-staining networkof reticular connective tissue fibers formingthe internal skeleton of the spleen (350x).White bloodcell(lymphocyte)Location:Lymphoid organs(lymph nodes, bone marrow, andspleen).SpleenReticularfibersFunction:Fibers form a softinternal skeleton (stroma) thatsupports other cell types includingwhite blood cells, mast cells, andmacrophages.Figure 4.8cConnective tissues.
Dense Regular Connective TissueClosely packed bundles of collagen fibersrunning parallel to direction of pullWhite structures with great resistance topullingFibers slightly wavy so stretch a littleFibroblasts manufacture fibers and groundsubstanceFew cellsPoorly vascularized
Connective tissue proper: dense connective tissue, dense regularDescription:Primarily parallelcollagen fibers; a few elastic fibers;major cell type is the fibroblast.Function:Attaches muscles tobones or to muscles; attachesbones to bones; withstands greattensile stress when pulling force isapplied in one direction.Location:Tendons, mostligaments, aponeuroses.ShoulderjointLigamentTendonCollagenfibersNuclei offibroblastsPhotomicrograph:Dense regular connectivetissue from a tendon (430x).Figure 4.8dConnective tissues.
Dense Irregular Connective TissueSame elements but bundles of collagenthicker and irregularly arrangedResists tension frommany directionsDermisFibrous joint capsulesFibrous coverings of some organs
Connective tissue proper: dense connective tissue, dense irregularDescription:Primarily irregularlyarranged collagen fibers; someelastic fibers; fibroblast is themajor cell type.Function:Withstands tensionexerted in many directions;provides structural strength.Location:Fibrous capsules oforgans and of joints; dermis of theskin; submucosa of digestive tract.ShoulderjointFibrousjointcapsulePhotomicrograph:Dense irregular connectivetissue from the fibrous capsule of a joint (430x).

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