Embryology and Ultrasound

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Embryology and Ultrasound

• The image on the left shows a human ovum
• The image on the right shows a fertilized egg
  (blue arrow), a 2-cell division of a fertilized
  egg (pink arrow), and 4-cell division of a
  fertilized egg( green arrow)
• Do we see these on ultrasound at this point?
• NO, too early to detect

2
Embryology and Ultrasound

• The image on the right shows the
  blastocyst,future baby, (blue arrow) implanting
  itself into the endometrium of the uterus (green
  arrow).
• The image on the left shows a complete
  implantation of the blastocyst within the
  endometrium of the uterus.
• Is this seen on ultrasound?
• Even it is still early, transvaginal ultrasound
  allows us to see what we call a gestational sac
  (pink arrow)
• An embryo is not seen at this point.

3
Embryology and Ultrasound

• This image shows an ultrasound of a 4-week
  pregnancy.
• Embryo (orange arrow)
• Yolk Sac (green arrow)
• Amniotic Fluid (blue arrow)

4
Embryology and Ultrasound

• The image on the right shows an 8-week pregnancy.
• The image on the left shows a 2D ultrasound image
  of the same gestational age.
• Yolk Sac (orange arrow)
• Yolk Stalk (black arrow)
• Baby (green arrow)

5
Embryology and Ultrasound

• The image on the right shows an 8-week pregnancy.
• The image on the left shows a 3D ultrasound image
  of the same gestational age.
• Yolk Sac (orange arrow)
• Yolk Stalk (black arrow)
• Baby (green arrow)

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Embryology and Ultrasound

• These images show a 9-week pregnancy.
• The image on the right is a 3D ultrasound while
  the one on the left is a 2D image.

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Embryology and Ultrasound

• This 3D image shows an 11-week pregnancy.

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Embryology and Ultrasound

• These images show a 12-week pregnancy.

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Embryolgy and Ultrasound

• These 3D ultrasound images show a 13-week
  pregnancy.

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Embryology and Ultrasound
These images show a 16-week baby (left) and a
17-week baby (right)
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Embryology and Ultrasound

• These images show a four and a half month baby.

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Embryology and Ultrasound

• These images show a 20-week baby.

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Embryology and Ultrasound
A 22-week baby
A 26-week baby
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Embryology and Ultrasound

• The above images show a 26-week baby.

A 31-week baby
A 27-week baby
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Embryology and Ultrasound
32-week baby
32-week baby
33-week baby
34-week baby
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Embryology and Ultrasound

• The image on the left is a 35-week baby
• The image on the right is a full-term baby

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Embryology and Ultrasound

• This 3D image shows four babies
• Find them!