The sacrum is a normal block vertebrae.

骶骨融合为正常现象。

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Block vertebrae occur when there is improper segmentation of the vertebrae, leading to parts of or the entire vertebrae being fused.

脊椎分节不全指不当分割的椎骨导致的部分或整个椎体的融合。

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Congenital vertebral anomalies, including butterfly, block, and transitional vertebrae, and hemivertebrae, are a collection of malformations of the spine in animals.

先天性脊柱畸形，包括蝴蝶椎、脊椎分节不全、椎骨移行、半椎等，指犬只各脊柱骨的形成异常。

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