1. Connective Tissues
Most diverse & abundant tissue

2. Main Role Strength against forces Protect organs Maintain organ shape
Provide frame for muscle pull

3. 2 Components Cells + matrix Cells Matrix ~ ground substance
Fibers + “Protein Glue” + Water
Non-living

4. Origin of ConnectiveTissue
Just notice that the cells, thus tissue, thus system originates from the mesoderm, as you learned previously

5. Connective Tissue Cells
Fibrocyte
Chondrocyte
Osteocyte
Hematopoietic stem cell (in bone marrow) red blood cell makers

6. Types of Fibers Reticular keeps cells in place
Collagen resists stretch
Elastic allows stretch

7. Tissues Described By : Amount of fibers : # of cells
Arrangement of fibers in matrix
Type(s) of fiber in matrix
Ability, function or location

8. Types
Connective proper
Cartilage
Blood
Bone

9. Connective Tissue Proper (1/4)
Loose
few fibers : more cells

10. Loose & Adipose Fiber type: almost none
Function: Energy storage, protection
Location
Under skin
Around organs
Behind eyeballs
Fastens kidneys

11. Function: scaffold for cell migration Location: lymph organs
Loose & Reticular
Fibers: reticular
Function: scaffold for cell migration
Location:
lymph organs
Lymph nodes
bone marrow
spleen

12. Loose & Areolar Fiber Type: collagen, reticular, elastic
Function: retains water; connects
epithelium to …?
Location
Under epithelia
Around organs
Surround capillaries

13. Dense more fibers : few cells
Connective Tissue Proper (1/4)
Dense
more fibers : few cells

14. Dense & Regular Description Parallel direction
collagen & some elastic fibers
High stretch strength
Poor vascular supply
Function
stress in one direction
Location
Tendons & ligaments
Bundle ends of muscles

15. Dense & Irregular Description Multi direction
collagen & elastic fibers
Resist stretch
Function
Withstand tension
structural strength
Location
Dermis of skin
digestive tract
joints and organs
Tension = “pulling”
Sclera of eye
Leather

16. Dense & Elastic Description Function Location
Elastic fibers, very little collagen
High elasticity
Function
Allow stretch
Location
Alveoli of lungs
Arteries

17. *Cartilage (1/4) 3 types Description Avascular, no nerves
Matrix up to 80% water

18. A. Hyaline (Glassy) Description a few collagen fibers Function
Resist repetitive stress
Support & reinforce
cushion
Location
End of long bones
Costal cartilage of ribs
nose, trachea, & larynx

19. B. Elastic Description More elastic fibers A Few collagen Function
Maintain shape
Great flexibility
Location
external ear
Epiglottis

20. C. Fibrous Description Thick collagen fibers Function Tensile strength
Absorb compression
Location
Intervertebral discs
Pubis symphysis
Disc of knee joint

21. *Blood Tissue (1/1) Description
Cells + fluid matrix + dissolved fibers
Function
transport gases,
nutrients, & waste
Location
blood vessels