-fibroblasts (secrete fiber proteins)
  -macrophages (engulf foreign particles)

– deposits of calcium salts  (2/3 of bone matrix is calcium phosphate, Ca3(PO4)2)
- 1/3 of bone matrix is protein fibers (collagen+noncollagenous proteins including osteocalcin, osteonectin, osteopontin, fibronectin and bone sialoprotein II, bone morphogenetic proteins (BMPs), and growth factors )

– form pathways for blood vessels
– exchange nutrients and wastes
-- the central is Haversian canal

Instead, spongy bone consists of an irregular lattice of thin columns of matrix called trabeculae (literally "little beams"), which contain lamellae, osteocytes, lacunae and canaliculi. The spaces between the trabeculae of some spongy bones are filled with red bone marrow (in some also yellow marrow contains

Blood vessels from the periosteum (see diagram above-right), penetrate into the trabeculae lattice allowing the osteocytes in the trabeculae to receive nourishment from the blood passing through the marrow cavities.

Spongy:

Compact

Spongy

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 1- Has the same embryonic origin as the other connective tissue types: Mesoderm -the middle of the three primary germ layers of the embryo (from it are derived the connective tissue) 
2- Blood connects the body systems together. 

1.Gel like matrix with all three fiber types present 

2.Three cell types present 

-Mast cells: produce heparin and histamine 

-Macrophages: are “big easters”. They eat bacteria and dead or dying cells. 

-Fibroblasts: fiber builders. 

Location： 

1. It may be found in tissue sections from almost every part of the body. 

2. The areolar tissue is found beneath the dermis layer and is also underneath  

the epithelial tissue of all the body systems that have external openings. 

Function： 

1.Wraps and cushions organs . 

2.Macrophages phagocytize bacteria . 

3.Holds and conveys tissue fluid

1.Adipocytes( fat filled cells) are ring shaped cells filled with tryglycerides. 

2.Has a chicken wire appearance. 

Found around organs, joints, surrounding the eyeball, within the abdomen. 

1. Shock absorption 

2. Energy storage 

3. Protection

4. Insulation