30 



THE HORSE IN HEALTH AND DISEASE 



Cancellated bone tissue is porous in appearance and composed 

 of great numbers of little bony plates and spicules surrounding 



Fig. 2. — Sagittal section of right large metatarsal bone: S.c, Compact 

 substance; S.s., spongy substance; C.m., medullary cavity; F.n., nutrient fora- 

 men. Note the greater thickness of the compact substance of the anterior 

 part of the shaft. (Sisson, Anatomy of Domestic Animals.) 



spaces that are filled with red marrow in the living animal. There 

 is little spongy tissue in the centers of the shafts of long bones, but 



