Sacrum The number of sacral vertebrae varies slightly. For instance, the S1S5 vertebrae of a horse will fuse, the S1S3 of a dog will fuse, and four pelvic vertebrae of a rat will fuse between the lumbar and the caudal vertebrae of its tail. The "Stegosaurus" dinosaur had a greatly enlarged neural canal in the sacrum, characterized as a "posterior brain case”. The sacrum is a complex structure providing support for the spine and accommodation for the spinal nerves. It also articulates with the hip bones. The sacrum has a base, an apex, and three surfaces – a pelvic, dorsal and
Ver sacrum of the Roman people ("iussu populi"), then he specified a long series of unfavourable events and circumstances which were as a rule regarded as invalidating but would not be so as far as the present "votum" was concerned in the case they happen. The overall authenticity of the formula preserved in Livy's passage has been noticed by Dumézil while the exceptional theological and juridical prudence showed by Lentulus in ensuring that both fraud and ignorance of private citizens would not affect the validity of the "sacrum" and harm the Roman people has been remarked by Bouché-Leclercq. Ver sacrum Ver sacrum