Translations:Kreuz- und Steißbein/10/en

The spinal canal (Canalis sacralis) ends caudally at the lower opening of the sacrum (Hiatus sacralis). It is caused by the undeveloped fifth vertebral arch, which lies between the Cornua sacralia. By fusion of the transverse processes the lateral parts of the sacrum (Pars laterales) are formed on both sides, on whose sides the ear-shaped joint surfaces (Facies auriculares) for the iliac bones lie.