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