venate具脉纹的venan.静脉venae nuasales externae鼻外静脉vena dipioica frontalis额板障静脉venae temporomaxillaris[医] 面后静脉vena thyroidea inferior甲状腺下静脉vena recurrens tibialis胫返静脉vena thyroidea superior甲状腺上静脉venae facialis anterior[医] 面前静脉, 面静脉venae centralis retinae[医] 视网膜中央静脉vena orbitalis anterior眶前静脉venae facialis communis[医] 面总静脉

1. The posterior borders of the left ventricle and inferior vena cava are well seen.
   左心室和下腔静脉的后界看得很清楚。
2. Its etiology is assumed to be abnormal embryologic development of the inferior vena cava as a result of atrophy failure of the right subcardinal vein in the lumbar portion.
   导因为下腔静脉的异常胚胎发展结果导致在腰部的右侧心下静脉未萎缩。