48 



ANATOMY FOR NURSES 



[Chap. IV 



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Composition 



Varieties 



Canals 



Haversian 



System 



I Haversian 



(Calcium phosphate. 

 Calcium carbonate. 

 Small portion of other salts. 

 i Blood-vessels. 

 Connective tissue. 

 Marrow. 

 Cancellated or .spongy. 

 Dense or compact like ivory. 

 [ Medullary — Yellow Marrow. 

 I Blood-vessels. 

 I Lymphatics. 

 Haversian canal. 

 Lamellae — bony fibres arranged in rings around 



Haversian canal. 

 Lacunae — small spaces between lamellae occupied 



b,v bone cells. 

 Canaliculi — canals which radiate from lacunae to 

 the Haversian canal. 

 Endosteum — A fibrous membrane that lines the medullary canal. 

 Fibrous tissue, blood-vessels, fat-cells, mar- 

 row cells, and red corpuscles. 

 (Yellow — found in medullary canals of long 

 bones. 

 Red — occupies spaces in cancellous bone. 



1. Supports blood-vessels, Ijmaphatics, and 

 nerves. 



2. Serves as a source of nourishment for 

 bone. 



3. Serves as location for formation of red 

 corpuscles. 



Periosteum — A vascular fibrous membrane that covers the bones 

 and serves to nourish them. Important in reunion of broken bone 

 and growth of new bone. 

 ( Fibres of Sharpey — Inward prolongations of periosteum. 



Marrow 



Consists of 



Varieties 



Fimction 



