sacral vertebrae S1-S5

sa·cral ver·te·brae [S1-S5]

the segments of the vertebral column, usually five, which fuse to form the sacrum. Synonym(s): vertebrae sacrales [SI-SV]

sa·cral ver·te·brae [S1-S5]

(sak'răl vĕr'tĕ-brē) The segments of the vertebral column, usually five in number, that fuse to form the sacrum.
Synonym(s): vertebrae sacrales [S1-S5].