Department of Anatomy, Faculty of Veterinary Medicine, University of Dicle, Diyarbakir, Turkey.
Anat Rec (Hoboken). 2010 Dec;293(12):2083-93. doi: 10.1002/ar.21269.
This study aims to determine morphological features of certain aural formations, varietal characteristics, and arterial supply in fetal development period in cattle. For this purpose, ears of 10 bovine fetuses in mid-gestation were evaluated. Organ morphology and vascularization in prenatal life were investigated by using corrosion cast technique. It was observed that some aspects of osseous formation and vascular organization in middle and inner ears were not developed completely in the first half of gestation; in addition, cochlea did not its snail-like structure yet, lateral semicircular canal was rather low compared to others and auditory ossicles did not take its final shape. The feeding blood vessels of inner ear were found to demonstrate three different distribution patterns, whereas feeding pattern in middle ear was very similar in many specimens. The presence of stapedial artery was also identified. Differences and similarities with other some species were assessed in terms of both general morphological structure and vascular organization. From this regard, it is thought that this study will constitute a comparative model for both humans and other species and provide morphological contributions since there is not sufficient literature on species-specific ear morphology in the field of veterinary anatomy in contrast to the abundance of studies on humans.
本研究旨在确定牛胎儿发育时期某些耳部形态特征、品种特征和动脉供应。为此，评估了 10 个中期胎牛的耳朵。通过腐蚀铸造技术研究了产前器官形态和血管化。观察到，中耳和内耳的一些骨形成和血管组织在妊娠前半段尚未完全发育；此外，耳蜗尚未形成蜗牛状结构，外侧半规管相对较低，听小骨尚未形成最终形状。内耳的滋养血管显示出三种不同的分布模式，而中耳的滋养模式在许多标本中非常相似。也确定了镫骨动脉的存在。从一般形态结构和血管组织两方面评估了与其他物种的异同。从这个角度来看，由于兽医解剖学领域中关于物种特异性耳部形态的文献相对较少，而关于人类的研究却很丰富，因此本研究将为人类和其他物种提供形态学贡献，构成一个比较模型。
