Endo H, Fujisawa M, Kurohmaru M, Hayashi Y
Department of Zoology, National Science Museum, Tokyo, Japan.
Anat Histol Embryol. 1998 Oct;27(5):327-30. doi: 10.1111/j.1439-0264.1998.tb00202.x.
The nasopharynx and eustachian tube (auditory tube) were morphologically examined in the white rhinoceros. The narrow nasopharynx cavity was enlarged dorsoventrally. The most lateral part of both sides sharply rises in a dorsal direction and the volume is estimated at 173 cc. The eustachian tube is 145 mm in length from the auditory bulla to the nasopharynx. The hyaline cartilage is well-developed in the middle region of the eustachian tube wall. The results demonstrated that the white rhinoceros does not have a guttural pouch. We suggest that the occurrence of the guttural pouch may not be dependent on the phylogenetic status of perissodactyls such as horse, donkey and tapir.
对白犀牛的鼻咽部和咽鼓管（耳咽管）进行了形态学检查。狭窄的鼻咽腔在背腹方向上扩大。两侧最外侧部分在背侧急剧上升，体积估计为173立方厘米。咽鼓管从听泡到鼻咽的长度为145毫米。透明软骨在咽鼓管壁的中部区域发育良好。结果表明，白犀牛没有喉囊。我们认为喉囊的出现可能不取决于马、驴和貘等奇蹄目的系统发育地位。
