Striated muscle cells connected with the neonate chondrocytes firmly.Neonate capillaries and micro blood vessels of various diameters were abundant in striated muscle stratum.

• 其外层可见横纹肌细胞，其间有大量的新生的直径不等的微血管和毛细血管，软骨细胞与肌细胞之间连接紧密。