Proximate cause, anatomical correlates, and obstetrical implication of a supernumerary lumbar vertebra in humans
{{output}}
Objectives: Three issues are considered on variation in number of presacral vertebrae (PSV) in humans: (1) sexual difference in number of PSV, (2) inactivation of Hoxd-11 gene as etiology for a supernumerary lumbar vertebra, and ... ...
