The synsacrum is a skeletal structure of birds and dinosaurs, in which the sacrum is extended by incorporation of additional fused or partially fused caudal or lumbar vertebrae. The innominate bones are fused with the synsacrum to a greater or lesser extent, according to species, forming an avian pelvis. This forms a more extensive rigid structure...
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http://en.wikipedia.org/wiki/Synsacrum
(from the article `bird`) ...and their articulations form the structural basis for a bellows action, by which air is moved through the lungs. Posterior to the thoracic ...
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http://www.britannica.com/eb/a-z/s/200
(pronounced sin-SAK-rum) The synsacrum is the fused part of a bird's vertebral column (backbone) between the thoracic vertebrae and the caudal vertebrae (the pelvic region near the base of the tail). The synsacrum is composed of fused vertebrae, including some thoracic, lumbar, sacral, and caudal vertebrae. The number of vertebrae in the synsacrum ...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
The segment of the vertebral column of birds that is formed by the fusion of some thoracic vertebrae with all of the lumbar, all of the sacral, and the first few caudal vertebrae; the synsacrum is in turn fused on either side with the ilium bones of the pelvis.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
a dorsal ridge of bone in the pelvic region of birds, formed by the fusion of certain thoracic, lumbar, sacral, and caudal vertebrae.
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https://www.infoplease.com/dictionary/synsacrum
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