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Chapter 2

MEDRADSC 2M03 Chapter Notes - Chapter 2: Infant, Yolk Sac, Genitourinary System


Medical Radiation Sciences
Course Code
Regy Mathew

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Embryonic development of the female genital system
- Formation of the embryo is important
- Imaging the uterus and embryos can be more difficult
- Development between the urinary and reproductive systems
o Know the normal and abnormal
o If there is something unusual in one system, it usually effects the other system
- Urogenital system/ genitourinary system
o Organ system for the reproductive and urinary
o Easy to image
Carnegie staging
- How we classify the embryo
- Depends on the age, size and structure
- Embryo develops in a specific order (different rates, but the segmentation helps classify)
- Applies to the first 8 weeks of gestation (when the organs are being formed in the
- After 8 weeks the last 23 stages occur (this is the fetal period)
- Occur when certain organs have been developed
1) Fetal period
- The UG system has 2 parts
o Reproductive and urinary
o They correlate to eachother
- Most diseases that occur at birth occur in the UG system, 50% being from the urinary
- Examples
o (agenesis), the kidneys and ureters don’t form
o Prenatal ultrasound can help see anomalies that have occurred in the ovaries,
uterus, vagina etc
2) Neonatal period
- Most common lesions are in the renal area
o Ovarian cysts are the most common inta-abdominal lesion in the neonate
o Image the pelvis of a young women to rule out any masses or obstructions
3) Premennarche through adulthood
- When puberty hits people can have menstrual irregulaties
- First time development abnormalities can be seen
Development of the female internal and external genitalia
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