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Relationship between rectal abdominis muscle position and physiological umbilical herniation and return: A
Xiang Ji1, Aoi Ishikawa1, Akari Nagata1
1Human Health Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Anatomical Record (Hoboken, N.J. : 2007)
|January 8, 2020
Summary
The formation of the rectal abdominis muscle (RAM) in human fetuses occurs independently of intestinal loop (IL) herniation phases. Fetal growth influences abdominal wall development, not the timing of IL return to the abdominal cavity.
Area of Science:
- Embryology
- Fetal Development
- Anatomy
Background:
- The development of the rectal abdominis muscle (RAM) and intestinal loop (IL) herniation are concurrent processes during human fetal development.
- Understanding the relationship between these events is crucial for comprehending abdominal wall formation.
Purpose of the Study:
- To investigate the correlation between the developmental stage of the RAM and the phase of IL herniation.
- To analyze the morphometric changes in the RAM and abdominal wall during fetal growth.
Main Methods:
- Utilized high-resolution magnetic resonance imaging (MRI) data from 19 human fetuses (CRL 22-69 mm).
- Analyzed the position and growth of the RAM relative to fetal size and umbilical ring dimensions.
- Measured abdominal circumference and RAM diastasis.
Main Results:
- RAM position shifted from lateral to midline with increasing fetal size.
- Abdominal wall growth, including RAM length and circumference, positively correlated with fetal growth.
- RAM diastasis and umbilical ring dimensions remained relatively constant, independent of IL herniation phase.
Conclusions:
- Rectal abdominis muscle formation is not dependent on the phase of intestinal loop herniation.
- Ventral body wall closure is primarily influenced by overall fetal growth rates rather than specific herniation events.
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