Structural characteristics of the trunk bone of Niangya Yak in Tibet

In order to further understand the structural characteristics of the trunk bone of Tibet niangya yak, the gross anatomical method was used to observe the trunk bone and measure the variation bone, and the structural characteristics of the trunk bone of Tibet Niangya yak were systematically analyzed by comparing with the trunk bone specimens of cattle and other breeds of yak. The results showed that there was no branch in the transverse process of the 7 th cervical vertebra of Tibet Niangya yak. There were 14 the dorsal spinous process of the third thoracic vertebrae was the highest. There were 5 lumbar vertebrae in Niangya yak, and the variation of the first lumbar vertebrae was very similar to that of the last thoracic vertebrae, but the left and right of the first lumbar vertebrae each had a bone extending laterally, with different lengths and very similar shape to the ribs. The length of the left bone was 15.5 cm and healed into a bone with the transverse process of the lumbar spine without articular surface. The right bone was 18.5 cm long and had a 7.5 cm cartilage at its lower end, which did not heal into a bone with the transverse process of the lumbar spine. The left and right bones extending outward did not heal into a bone with the transverse process of the lumbar spine. There were 5 sacral vertebrae, healed into sacral bones, sacral wings developed, 17 caudal vertebrae and 14 pairs of ribs, including 8 pairs of true ribs. The sternum was composed of 7 sternal segments, which were flattened from top to bottom. The ventral side was flat and the the posterior orifice of the thoracic cage is extremely broad. The results indicated that the dorsal spinous process of the third thoracic vertebra was the highest in Tibet Niangya yak, while the first lumbar vertebra was mutated. The bone extending from left to right was not the rib, but the transverse process of the lumbar spine.