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 occipialization of C1
atlas assimilation
what is the incidence of occipitalization of C1
.1-.8% incidnece
what do the centers of ossification for the odontoid 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 between the odontoid process and ossification centers and the centrum of C2
the subdental synchondrosis
what is the classification of the 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 centrum 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 odontoid process and centrum of C2 which is still evident beyond age 7
persistent subdental synchondrosis
what is the name given to the joint formed between the tip of the dens and the odontoid process centers of ossification
tip of the dens synchondrosis
what is the classification of the joint formed between the tip of the dens and odontoid process centers of ossification
amphiarthrosis synchondrosis
at what age will the tip of the dens center of ossification appear
sometime in early adolescence
based on the age of appearance how is the tip of the dens center of ossification classified
secondary center of ossification
at what age will the tip of the dens fuse with the odontoid process
before age 12
if the joint formed between the tip of the dens and odontoid process centers of ossification persists beyond age 23, what is the condition called terminal ossicle
terminal ossicle
what is a basilar impression
persistence of the nonunion of the basilar and condylar parts of the chondrocranium such that the cartilage deforms due to the weight of the brain
what what is a basilar invagination
the upper cervical spine appears to be invaginated into the skull on x-ray analysis
What is the incidence of rib-related changes following dorsalization of C7
from one-half to two and one-half percent of the population
do patients typically present with symptoms specific for dorsalization of C7
no, they are typically asymptomatic
what is the gender bias suggested in dorsaliation of C7
female
What alterations in C7 facet orientation may accompany dorsalization
the superior articular facet of C7 may change from BUM to that of a typical thoracic BULL the inferior articular facet is unchanged
what alteration in C6 facet orientation may accompany dorsalization
C6 demonstrates a change in inferior articular facet from FoLD to ForMD superior articular facet is unchanged.
