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Related to transitional vertebra: block vertebrae
n a congenital vertebral defect in which the vertebra develops features of the adjoining region or structure—for example, lumbosacral or cervicothoracic—resulting in major postural effects on the vertebral column.
at the junction of two regions, e.g. lumbar and sacral, which take on the characteristics of the arch and articular processes of the next section.