Search results
Results From The WOW.Com Content Network
Platybasia is a spinal disease of a malformed relationship between the occipital bone and cervical spine. ... "Platybasia and basilar invagination". Eur.
Basilar invagination is invagination (infolding) of the base of the skull that occurs when the top of the C2 vertebra migrates upward. It can cause narrowing of the foramen magnum (the opening in the skull where the spinal cord passes through to the brain). It also may press on the lower brainstem. [1]
Potentially life-threatening complications, all of which become more common in more severe OI, include: tearing of the major arteries, such as the aorta; [1]: 333 [11] pulmonary valve insufficiency secondary to distortion of the ribcage; [1]: 335–341 [12] and basilar invagination. [13]: 106–107
Several indirect measurements on CT can be used to assess ligamentous integrity at the craniocervical junction. The Wackenheim line, a straight line extending along the posterior margin of the clivus through the dens, should not intersect the dens on plain film, with violation of this relationship raising concern for basilar invagination.
Other features are: parietal bossing, basilar invagination (atlantoaxial impaction), persistent metopic suture, abnormal ear structures with hearing loss, supernumerary ribs, hemivertebrae with spondylosis, small and high scapulae, hypoplasia of illiac bones, absence of the pubic bone, short / absent fibular bones, short / absent radial bones ...
Basal chordates rely predominantly on invagination, anamniote vertebrates and reptiles on a varying combination of involution and ingression, and birds and mammals primarily on ingression. [6] Besides ingression, two other types of internalizing cell movements may occur during gastrulation: invagination and involution. [7]
Invagination is the process of a surface folding in on itself to form a cavity, pouch or tube. In developmental biology , invagination of epithelial sheets occurs in many contexts during embryonic development .
It attaches to the basilar part of occipital bone, the petrous part of the temporal bone (medial to the pharyngotympanic tube), the (posterior border of the) medial pterygoid plate, and the pterygomandibular raphe. It diminishes in thickness inferiorly. Posteriorly, it is reinforced by the pharyngeal raphe. [1]