sacral vertebrae


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sacral vertebrae

[′sak·rəl ′vərd·ə‚brā]
(anatomy)
Three to five fused vertebrae that form the sacrum in most mammals; amphibians have one sacral vertebra, reptiles usually have two, and birds have 10-23 fused in the synsacrum.
References in periodicals archive ?
The apex of the medullary cone occurs between the fifth or sixth lumbar vertebra in pigs, between the sixth or seventh lumbar vertebra in dogs, the second sacral vertebra in horses, and more variably between the sixth lumbar and third sacral vertebrae in cats (DYCE et al., 2004).
Just a few million years younger than Ambulocetus, but substantially older than later whales fully committed to the sea, Rodhecetus bore a shorter hind limb and, like modern whales, unfused sacral vertebrae.
(8,9) In birds, the synsacrum is composed of the fused lumbar and sacral vertebrae and pelvis, so only the atlanto-occipital space is accessible.
The cervical, thoracic, lumbar, and sacral vertebrae were scored for degree of ossification and morphological defects.
At this segment, the foal showed little development being almost imperceptible to the level of the second sacral vertebrae. No transverse branches were observed in the sacral IVVP of foals (Fig.
(b) Postcontrast T1-weighted sagittal image with fat suppression shows heterogeneous enhancement of the mass and sacral vertebrae.
The sacral hiatus, resulting from failure of fusion of lamina and spinous process of lower sacral vertebrae, is the caudal termination of the sacral canal.