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Functional development of the sheep diaphragmatic ligament
1Fetal and Neonatal Physiology Unit, Monash Medical Centre, Clayton, Victoria, Australia. ROBERT.GRIFFITHS@JCU.EDU.AU
The Journal of Physiology
|May 1, 1996
Summary
The diaphragmatic ligament is stiffer in fetal sheep, supporting diaphragm development. Its elasticity regulates muscle fiber stress, ensuring proper growth before birth.
Area of Science:
- Physiology
- Developmental Biology
- Biomechanics
Background:
- The diaphragmatic ligament influences adult diaphragm passive compliance.
- Elastic tissues often exhibit greater compliance in younger organisms.
Purpose of the Study:
- Investigate the role of the diaphragmatic ligament in diaphragm development.
- Determine if the diaphragmatic ligament is crucial during fetal and neonatal stages.
Main Methods:
- Examined passive biaxial length-tension properties of sheep diaphragms (fetal, newborn, adult).
- Compared properties with the diaphragmatic ligament intact versus removed.
Main Results:
- The diaphragmatic ligament is stiffer in fetal development compared to adults.
- It supports approximately 75% of passive tension in fetuses, decreasing to 50% by 3 weeks post-birth.
- Fetal diaphragm muscle fibers experience 1-7 kPa of stress during late gestation.
Conclusions:
- The diaphragmatic ligament acts as a structural framework for fetal diaphragm muscle growth.
- Ligament elasticity is regulated to maintain low, constant stress on developing muscle fibers.
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