Franz S, Hofmann-Parisot M, Baumgartner W, Windischbauer G, Suchy A, Bauder B
Clinic for Ruminants and Swine, University of Veterinary Medicine, Vienna, Austria.
Vet Rec. 2001 Jul 28;149(4):109-12. doi: 10.1136/vr.149.4.109.
When the isolated teat of a cow was examined with an 8.5 MHz linear array transducer in a vertical plane, the teat canal appeared as a thin, white line, bordered on each side by parallel, thick, grey-black bands. In a horizontal plane a comparable image was obtained. In a sheep, images of comparable quality were obtained with a 12 MHz transducer. Histological studies of the tissues whose removal led to the disappearance of this characteristic ultrasonographic appearance showed that it was associated with the stratified keratinised squamous epithelium with distinct papillae. The content of keratin in the stratum corneum was apparently responsible for the bright zone; the stratum lucidum was not visible, and the surrounding dark, less echoic area was associated with the stratum granulosum. Doppler echography in live animals confirmed this designation. The outer layers of the teat wall were more echogenic.
当用8.5兆赫的线性阵列换能器在垂直平面检查奶牛的离体乳头时，乳头管呈一条细白线，两侧为平行的、厚的灰黑色带。在水平平面上可获得类似图像。用12兆赫换能器对绵羊进行检查，也获得了质量相当的图像。对去除后导致这种特征性超声表现消失的组织进行组织学研究表明，它与具有明显乳头的分层角质化鳞状上皮有关。角质层中的角蛋白含量显然是形成亮区的原因；透明层不可见，周围较暗、回声较少的区域与颗粒层有关。对活体动物的多普勒超声检查证实了这一结论。乳头壁的外层回声更强。
