Transition Zones Flashcards
What is/are the characteristics of cervicalization of occiput?
An increase in occipital bone size, formation of new or larger lines on the occipital bone.
What are the possible transition zone - segmental combinations?
- ) cervicalization of occiput - occipitalization of C1
- ) dorsalization of C7 - cervicalization of T1
- ) lumbarization of T12 - dorsalization of L1
- ) sacralization of L5 - lumbarization of S1
- ) coccygealization of S5 - sacralization of Co1
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 occipitalization of C1?
Atlas assimilation.
What joint is formed between the odontoid process ossification centers and the centrum if C2?
The subdental synchondrosis.
What is the name given to the condition in which the joint formed between the odontoid process of 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 often 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 the odontoid process centers of ossification?
Amphiarthrosis synchondrosis.
At what age will the tip of the dens center of ossification appear?
Sometime in early adolescence.
If the joint formed between the tip of the dens and odontoid process centers if ossification persists beyond age 12, what is the condition called?
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 is a basilar invagination?
The upper cervical spine appears to be invaginated into the skull on x-ray analysis.
What is the gender bias suggested in dorsalization of C7?
Female.
What is the gender bias associated with dorsalization of L1?
Males are two to three times more affected.
