מישורים אנטומיים

רקמות חיבור

1.Fibrous connective tissue (a.k.a. connective tissue proper) 2.Supporting connective tissue 3.Fluid 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): 1.Hyaline Cartilage 2.Elastic Cartilage 3.Fibrocartilage. 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