מישורים אנטומיים
רקמות חיבור
.1Fibrous connective tissue (a.k.a.
connective tissue proper)
.2Supporting connective tissue
.3Fluid connective tissue
Categories of CT
Blood
Bone
Loose Connective Tissue
Collagen Fibers as seen with a scanning electron microscope
Reticular Fibers
•A thinner collagen fiber coated with
glycoproteins.–Stained black in
the adjacent micrograph of the
liver.
Elastic Fibers
•Made primarily of a protein called elastin,
whose coiled structure allows it to stretch and
snap back like a rubber band.
•Account for the ability of the lungs, arteries,
and skin to spring back after they are stretched.
Dense Irregular CT•Many collagen fibers
in different orientations
•Resists tension in different directions
•Example: dermis,
4.12e
Dense Regular CT•Collagen fibers all
parallel•Resists tension in
one direction–Located in tendons &
ligaments
4.12f
Adipose CT•90% fat cells•High metabolic
activity•Absorb and release
lipids
4.12c
Supporting Connective Tissue
•They provide the majority of the
structural support of the human
body.
•2 types:–Cartilage–Bone.
1
2
Cartilage
•Supportive CT with a flexible, rubbery matrix.
•Cells called chondroblasts secrete the
matrix and surround themselves in it until they
become trapped in little cavities known as lacunae (lacuna is Latin for “lake”).
•Once enclosed in lacunae, cells are called chondrocytes.
Cartilage
•Cartilage is avascular and chondrocytes depend on the
diffusion of nutrients through the stiff, viscous matrix .
Cartilage
•3 types (classified based on fiber differences):
.1Hyaline Cartilage
.2Elastic Cartilage
.3Fibrocartilage.
12
3
Hyaline Cartilage
•Microscopic Appearance:
–Clear, glassy matrix, often stained light blue or
pink.•Hyalos is Greek for
glass.
סחוס אלסטי
Fibrocartilage
–Parallel collagenous fibers similar to those of
tendon.
Fibrocartilage