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[Long palmar muscle (M. palmaris longus) in human fetuses]
Gegenbaurs Morphologisches Jahrbuch
|January 1, 1981
Insights
The study compared Musculi palmares longi in human fetuses, finding that venter reduction occurs via muscle fiber atrophy and connective tissue penetration. This process was significantly more pronounced in female fetuses.
Area of Science:
- Anatomy
- Developmental Biology
- Histology
Context:
- The Musculus palmaris longus is a superficial forearm muscle.
- Its anatomical variations and developmental processes are crucial for understanding forearm biomechanics.
- Previous research has not fully elucidated the microstructural changes during its development, particularly sex-based differences.
Purpose:
- To compare the length of the venters and tendons of the Musculi palmares longi in human fetuses.
- To investigate the histological mechanisms underlying venter reduction in this muscle.
- To determine if there are sex-based differences in the observed developmental processes.
Summary:
- The study examined 90 human fetuses (4-7 months gestation), comparing venter and tendon lengths of the Musculi palmares longi.
- An intramuscular tendon portion was identified, with venter reduction attributed to muscle fiber atrophy and connective tissue infiltration.
- This atrophy mechanism was observed to be significantly more prevalent in female fetuses.
Impact:
- Provides novel insights into the developmental anatomy of the Musculus palmaris longus.
- Highlights potential sex-dimorphic developmental pathways in human skeletal muscles.
- Contributes to a deeper understanding of forearm muscle development and variation.
Abstract:
In 90 human foetuses between 4 and 7 months of fetal life we compared the length of the venters and tendons of Musculi palmares longi. We observed an intramuskular part of tendon and it was revealed that the mechanism of the venter reduction is due to penetration of the connective tissue streaks in place of the muscle fibres being in the course of atrophy. This process has occurred significantly higher in the female foetuses.