Normal fetal echo quiz

Name the structures marked by the numbers 1,2 and 3 in this fetal echo of a 28 week fetus:
Still image is shown below:

The ultrasound video of this same case is shown below:

Hint: see: http://www.ultrasound-images.com/normal-anatomy.htm#Normal_3_vessel_view_in_a_28_week_fetus