from The Century Dictionary.
- Ossifying; osteogenic; making bone; causing ossification, or converting connective or cartilaginous tissue into bone: as, an ossific process. See
from the GNU version of the Collaborative International Dictionary of English.
- adjective Capable of producing bone; having the power to change cartilage or other tissue into bone.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Capable of producing
bone; having the power to change cartilageor other tissueinto bone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Such is not a counsel of ossific reaction, quite the contrary.
Under the slightest irritation or stimulation, however, their bone-forming functions are stirred into abnormal activity, thus explaining how easy it is (especially with bones so open to receive slight injuries as are those of the foot) to get ossific deposits, the starting-point of which we are quite unable to account for.
About the ninth week of fetal life an ossific center appears for each of the small wings (orbitosphenoids) just lateral to the optic foramen; shortly afterward two nuclei appear in the presphenoid part of the body.
These accessory nuclei possess no separate ossific centers, but are invaded by the surrounding membrane bone and undergo absorption.
The ossific nuclei make their appearance in the following order: in the first segment between the first and fourth years; in the second between the fifth and tenth years; in the third between the tenth and fifteenth years; in the fourth between the fourteenth and twentieth years.
The first ossific nuclei are those for the great wings (ali-sphenoids) 33.
The labyrinths are first developed, ossific granules making their appearance in the region of the lamina papyracea between the fourth and fifth months of fetal life, and extending into the conchæ.
The inner alveolar border, usually described as arising from a separate ossific center (splenial center), is formed in the human mandible by an ingrowth from the main mass of the bone.
The fontanelles are usually closed by the growth and extension of the bones which surround them, but sometimes they are the sites of separate ossific centers which develop into sutural bones.
The ossific centers appear in the intervals between the articular depressions for the costal cartilages, in the following order: in the manubrium and first piece of the body, during the sixth month; in the second and third pieces of the body, during the seventh month of fetal life; in its fourth piece, during the first year after birth; and in the xiphoid process, between the fifth and eighteenth years.