单词	synsacrum
释义	synsacrum /sɪnˈseɪkrəm / /sɪnˈsakrəm/ noun (plural synsacra /sɪnˈsakrə/ 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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