Transition Zones Flashcards
What is/are the characteristics of occipitalization of C1?
the atlas may be partially or completely fused to the occiput
What is another way of implying occiptilization of C1?
atlas assimilation
What is the incidence of occipitilization of C1?
.1% to .8%
When do the centers of ossification for the ondontoid process first appear?
during the last trimester in utero
When do the bilateral ossification centers for the odontoid process fuse?
at or shortly after birth
What joint is formed by the odontoid process and ossification and the centrum of C2?
the subdental synchondrosis
What is the classification of joint formed between C2 odontoid process and the centrum?
amphiarthrosis synchondrosis
Ossification between the odontoid process and centrum joint of C2 first appears at what age?
4 years old
A joint between the odontoid process and centum of C2 is last identified at what age?
7 years old
What is the name given to the condition in which the joint formed between the odontoid process and centrum of C2 persists beyond age 7?
os odontoideum
What is the name given to the joint between the tip of the dens and the odontoid process centers of ossification?
tip of the dens synchondrosis
What is the name given to the joint between the odontoid process and centrum of C2 which is stil evident beyond age 7?
persistent subdental synchondrosis
At what age will the tip of the dens center of ossification appear?
sometime in early adolescence
At what age will the tip of the dens fuse with the odontoid process ?
before the age of 12
If the joint formed between the tip of the dens and the odontoid process centers of ossification persists beyond age 12, what is the condition called?
terminal ossicle