| 12. The  most  common  origin  of  the  artery  of Adamkiewicz is Adamkiewicz 动脉最常见的起源在(A)  between T4 and T6
 (B)  at T7
 (C)  between T8 and L3
 (D)  at L4
 (E)  at L5
 
 
 
 
 
 
 12.  (C) The  artery  of Adamkiewicz  originates  on the  left  between  the  T8  and  L3  level  in  most cases.  This  is  the  largest  of  the  feeder  arteries that  supplies  the  anterior  spinal  artery.  The artery of Adamkiewicz enters through an intervertebral foramen between T8 and L3 to supply the lumbar enlargement.In  a  small  percentage  of  cases  (15%)  the take  off  is  higher  at  T5.  In  this  case  a  slender contribution  from  the  iliac  artery  enlarges  to compensate for the increased blood flow to the lumbar portion of the cord and the conus.
 The cervical portion up to the upper thoracic region, the anterior spinal artery receives contributions  from  the  subclavian  arteries.  By the  time  the  blood  reaches  the  T4  segment  it becomes tenuous. Although, the T4 to T9 area of the  spinal  cord  receives  blood  from  the  feeder vessels, it is relatively small.多数情况下,Adamkiewicz 动脉起源于T8-L3节段的左侧。这是汇入脊髓前动脉中最大的一支。Adamkiewicz 动脉穿过T8-L3的椎间孔供应脊髓腰膨大段。少数情况下(15%),其起源可高达T5,此时来这髂动脉的细小分支变得粗大以代偿供应脊髓腰段和圆锥的血流。在颈段和上胸段,锁骨下动脉分支汇入脊椎前动脉,到T4阶段时,血流变得稀少。T4-T9节段的脊髓也有支线血管供应,但相对较小。
 
 
 
 
 
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