basion


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basion

(ˈbeɪsɪən)
n
(Anatomy) anatomy the midpoint on the forward border of the foramen magnum
[C19: from New Latin, from Latin basis base1]
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No Anatomical landmarks definitions 1 Minimum frontal breadth Distance between the two frontotemporale (ft) 2 Biorbital breadth Distance between right and left ectoconchion (ec) 3 Bizygomatic diameter Distance between most lateral points on the zygomatic arches 4 Nasal breadth Maximum breadth of the nasal aperture 5 Orbital height Distance between the superior and inferior orbital margins 6 Foramen magnum breadth Distance between the lateral margins of foramen magnum at the points of greatest lateral curvature 7 Foramen magnum length Distance from basion (ba) to opisthion (o) 8 Foramen ovale Distance between left and right of foramen ovale 9 Foramen spinosum Distance between left and right of foramen spinosum Table 4: Dimensional measurements of dry skull and CAD models.
Farmers at Qaransho village in Basion area in Gharbeya Governorate harvested their rice crops in late September, ending a season which they described as "one of the best in recent years".
Anterior boundary: line connecting the anterior nasal spine (ANS) and the apex of the nasal bone; posterior boundary: line extending from sella (S) to posterior nasal spine (PNS); superior boundary: line connecting basion or the highest point on the nasal bone 1 mm inferior to the edge of the field of view and S; and inferior boundary: line extending from ANS to PNS.
The basion-dens interval (BDI, distance from basion to upper odontoid tip) should be <12 mm in 95% of patients.
Basion and Ophisthion were marked 'A' and 'B' respectively (Figure 1).
Mas superficialmente se configuran dos grupos de raices que perforan la duramadre encefalica en la zona de la fosa craneal posterior por detras y lateralmente al basion (punto medio anterior del foramen magno u occipital) para fusionarse y abandonar el craneo a traves del foramen condileo anterior, tambien denominado canal o conducto para el nervio hipogloso [22,23].
Basion (Ba): The midpoint of the anterior margin of the foramen magnum.
Encontraron que todos los puntos presentan similar reproducibilidad en las dos radiografias, excepto infraorbitario, espina nasal posterior, articular, porion y basion con menor error interobservador en la imagen digital directa; en otro estudio, Sandler reporto que los puntos articular y gonion son mas reproducibles con el trazo manual.
These include the opisthion (the dorsal border of the foramen magnum), basion (the ventral border of the foramen magnum), clivus, hard palate, atlas, pedicle of axis, and tip of the odontoid process.
For example, the basion-dens interval is measured as the distance between the basion (the midpoint on the anterior margin of the foramen magnum on the occipital bone) and the odontoid process.