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Normal Spine
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19 weeks a b  
Sagittal and coronal images of the normal thoracolumbar spine. The umbilical cord (arrows) can be seen proximal to the fetal pelvis.  
a b  
Axial view of the cervical spine (arrow). This image clearly depicts C1, the atlas. Cervical spinal cord in spinal canal.  
21 weeks c d d
  The spinal cord is clearly seen. Note the atlas encircling the spinal cord (arrow). The junction of the pyramidal decussation and rostral spinal cord (arrow) is visible in this plane.
22 weeks c d  
       
24 weeks c c c
  Cervical spine of the presenting twin (image oriented for fetal anatomy; maternal cervix is at top) is clearly visible.  
c c c
T1-weighted image. Note that the colon is bright on T1.
26 weeks c c c
    Diamniotic dichorionic twins. The spine of the male twin is clearly visible in this plane.
c c  
     
27 weeks c c  
  Normal lordosis of the lumbar spine means multiple planes are required to visualize entire spine.  
29 weeks c c  
       
32 weeks c c  
    Water excitation sequence distinguishes individual vertebrae.  
35 weeks c c  
     
c c