<Tr> <Th> FMA </Th> <Td> 16202 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of bone (edit on Wikidata) </Td> </Tr> <P> The sacrum (/ ˈsækrəm / or / ˈseɪkrəm /; 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 S1--S5 between 18 and 30 years of age . </P> <P> The sacrum is situated at the upper, back part of the pelvic cavity, between the two wings of the pelvis . It forms joints with four other bones . The two projections at the sides of the sacrum are called the alae (wings), and articulate with the ilium at the L - shaped sacroiliac joints . The upper part of the sacrum connects with the last lumbar vertebra, and its lower part with the coccyx (tailbone) via the sacral and coccygeal cornua . </P>

Where is the sacral located on the body