Takahashi Naoki, Hirose Takuya, Minaguchi Jun A, Ueda Hiromi, Tangkawattana Prasarn, Takehana Kazushige
Laboratory of Veterinary Microanatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan.
Laboratory of Veterinary Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan.
J Vet Med Sci. 2018 Mar 24;80(3):405-412. doi: 10.1292/jvms.17-0562. Epub 2018 Jan 12.
Superficial digital flexor tendon (SDFT) of the bovine hindlimb originates from the caudolateral aspect of the distal femur and finally inserts onto the plantar aspect of the middle phalanges. In the present study, morphology and morphometry of the bovine SDFT at the muscle-tendon junction (MTJ), middle metatarsus (mM) and tendon-bone interface (TBI) were investigated. Cross-sectional morphology at the three regions of SDFT were oval, semioval and ring-formed, respectively. Significant difference in cross-sectional area was found only between MTJ-mM and mM-TBI (P<0.05). Functional compression and friction from the adjacent structures could be the most potential interactions affecting such appearances. Morphometric data of tenocyte number, water content, and glycosaminoglycan (GAG) length and angle were found increasing in the proximodistal direction, except the fibril diameter and collagen fibril index (CFI). Statistical analyzes could reveal significant differences in average number of tenocytes (P<0.0001), CFI (between MTJ-mM and MTJ-TBI, P<0.05), water content (between MTJ-TBI, P<0.05), length of GAG chains (between MTJ-TBI, P<0.05), and angle of GAG chains (P<0.0001), respectively. The fibrillar characteristics at the three different areas, including fibril diameter distribution and interfibrillar distance, existed in conforming to the tensional axes in situ. In addition, length and angle of GAG chains were relevant to moving directions of the collagen fibrils.
牛后肢的指浅屈肌腱（SDFT）起源于股骨远端的后外侧，最终止于中节指骨的跖侧。在本研究中，对牛SDFT在肌腱-肌肉连接处（MTJ）、跖骨中部（mM）和肌腱-骨界面（TBI）的形态和形态测量进行了研究。SDFT三个区域的横截面形态分别为椭圆形、半椭圆形和环形。仅在MTJ-mM和mM-TBI之间发现横截面积有显著差异（P<0.05）。来自相邻结构的功能压缩和摩擦可能是影响这种外观的最潜在相互作用。发现除了原纤维直径和胶原原纤维指数（CFI）外，腱细胞数量、含水量以及糖胺聚糖（GAG）长度和角度的形态测量数据在近端到远端方向上增加。统计分析分别显示腱细胞平均数量（P<0.0001）、CFI（MTJ-mM和MTJ-TBI之间，P<0.05）、含水量（MTJ-TBI之间，P<0.05）、GAG链长度（MTJ-TBI之间，P<0.05）和GAG链角度（P<0.0001）存在显著差异。三个不同区域的纤维特征，包括原纤维直径分布和纤维间距离，与原位张力轴一致。此外，GAG链的长度和角度与胶原原纤维的移动方向有关。
