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Embryonic and early fetal development of the human scapholunate ligament
Sánchez-Montesinos1, F Hita-Contreras2, P Hernández-Cortés3
1Department of Human Anatomy and Embryolog, School of Medicine, University of Granada, Avda. De Madrid, 11, Granada 18012, Spain.
Insights
The human scapholunate ligament develops from mesenchymal tissue into a C-shaped structure by week 14. This study details its embryonic and fetal development, aiding in understanding wrist injuries.
Area of Science:
- Developmental anatomy
- Human embryology
- Wrist biomechanics
Background:
- Detailed studies on human wrist ligament development are limited.
- The embryonic and early fetal development of the scapholunate ligament remains uncharacterized.
Purpose of the Study:
- To provide a detailed description of the origin and chronological development of the human scapholunate ligament.
- To aid in understanding the etiopathogenesis and clinical implications of scapholunate ligament injuries.
Main Methods:
- Analysis of 32 human embryos (8-31mm crown-rump length).
- Examination of 26 human fetuses (33-102mm length).
Main Results:
- Mesenchymal tissue observed at Carnegie stage 20 (20mm) between developing wrist bones.
- Septum formation and regression noted, defining articular cavities by stage 22 (22mm).
- Scapholunate ligament achieves adult morphology by week 14, with residual septum possibly indicating the radioscapholunate ligament.
Conclusions:
- Detailed description of scapholunate ligament origin and development provided.
- Findings may improve understanding of wrist injury mechanisms and clinical implications.
Background:
although the development of the human wrist ligaments has been studied, to our knowledge, a detailed study of the development of the scapholunate ligament during the embryonic and early fetal period has not been performed.
Methods:
we have analyzed 32 human embryos ranging from 8 to 31 mm of crown-rump length, and 26 fetuses ranging 33-102 mm long.
Results:
our observations showed that, in Carnegie stage 20 (20 mm), we can observe a mass of mesenchymal tissue between the cartilaginous anlages of the lunate, the scaphoid and the radius, that in stage 22 (22 mm) adopts the shape of a septum that delimits two articular cavities between the radius with respect to the scaphoid and the lunate. In fetuses of 52 mm (week 11) the regression of this septum begins in a dorso-palmar direction and is no longer present in 12-week specimens. Finally, in week 14 the morphology of the scapholunate ligament is similar to the C-shaped configuration described in adult life, with a broader dorsal part, which becomes thinner in its distal part, and forms a condensed proximal band. In most palmar sections, a rest of that septum remains, which could be an indication of the presence of the radioscapholunate ligament.
Conclusions:
our findings allow us to provide a detailed description of the origin and chronological development of the scapholunate ligament, and these results may be of help in better understanding the etiopathogenesis and the possible clinical and biomechanical implications related to the injury of this anatomical structure.
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