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Platybasia is a spinal disease of a malformed relationship between the occipital bone and cervical spine. It may be caused by Paget's disease . Platybasia is also a feature of Gorlin-Goltz syndrome , commonly known as basal cell nevus syndrome.
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]
Halo-gravity traction (HGT) is a type of traction device utilized to treat spinal deformities such as scoliosis, [1] [2] congenital spine deformities, cervical instability, basilar invagination, and kyphosis. [3] It is used prior to surgical treatment to reduce the difficulty of the following surgery and the need for a more dangerous surgery.
In tunicates, invagination is the first mechanism that takes place during gastrulation. The four largest endoderm cells induce the invagination process in the tunicates. Invagination consists of the internal movements of a sheet of cells (the endoderm) based on changes in their shape.
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.
Here the mesoderm extends forward in the form of two crescentic masses, which meet in the middle line so as to enclose behind them an area that is devoid of mesoderm. Over this area, the ectoderm and endoderm come into direct contact with each other and constitute a thin membrane, the buccopharyngeal membrane , which forms a septum between the ...
Constriction of the apical side of cells in an epithelial layer generates enough force initiate invagination. In gastrulation, the apically constricting cells are known as bottle cells. The bottle shape results when constriction of the apical side of the cell squeezes the cytoplasm, thus expanding the basal side.
The pharyngobasilar fascia is a fascia of the pharynx. [1] It is situated between the mucous and muscular layers of the pharynx. [citation needed] It is formed as a thickening of the pharyngeal mucosa superior to the superior pharyngeal constrictor muscle.