callus

(kal’us) [L.].. 1. A callosity. 2. The plastic exudate exuded about the fragments of a broken bone and accomplishing the work of repair. central c., provisional callus formed within the medullary cavity of a bone. itive c., the exudate formed between the fractured ends of the bone; it is permanent, and becomes changed into true bone. on sheathing c., a variety of callus which is external and temporary, forming a sheath about the seat of fracture: after repair it is absorbed. permanent c. Same as definitive c. pin c., provisional callus in the medullary canal. provisional c., temporary c., the ensheathing callus plus a temporary plug of similar material within the medullary canal.