noun (plural synsacra /-ˈsakrə/ /-ˈsākrə/ or synsacrums)Zoology
An elongated composite sacrum containing a number of fused vertebrae, present in birds and some extinct reptiles.
- The posterior thoracic vertebrae, synsacrum, and hindlimb are pneumatized by diverticula of the abdominal air sacs.
- In most birds, diverticula of the abdominal air sacs pneumatize the posterior thoracic vertebrae and synsacrum later in ontogeny.
- Between the notarium and synsacrum were several dorsal vertebrae that may have provided some level of dorsoventral mobility.
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