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The fused lumbar vertebrae (L) of the female Cheju native horse were observed macroscopically.The 5th L and 6th L were partially fused. They were composed of four parts between the spinous process of the 5th L and 6th L, left and right transverse process of the 5th L and 6th L, caudal articular process of the 5th L and cranial articular process of the 6th L, and fossa of vertebra of the 5th L and head of vertebra of the 6th L. The dorsal lumbar foramen and ventral lumbar foramen were formed each at left and right of medial parts in the fused transverse processes of the 5th and 6th lumbar vertebrae.