Sacrum caudal and thoracic vertebrae to form a single structure called the synsacrum. In the frog the ilium is elongated and forms a mobile joint with the sacrum that acts as an additional limb to give more power to its leaps. Sacrum The sacrum ( or ; plural: "sacra" or "sacrums"), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of sacral vertebrae S1S5 between 18 and 30years of age. The sacrum is situated at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It
Ver sacrum of Indo-Iranian human and warrior gods with animal forms: among the Iranian god of victory "V(e)r(e)thragna" 's incarnations, seven are of animal form, including the bull, horse, boar and hawk, each of which is associated at one time or another with a "ver sacrum" and Roman army insignia. On the "recto" of coins from Campania appears a human character bearing over his head that of a boar, and on the "verso" the word "ROMA". German scholar C. Koch interprets this character as god Quirinus, since he identifies the boar, "aper", as the animal symbol of the god. Dumézil remarks that