Skeletal relationships in the human embryonic foot based on three-dimensional reconstructions

Area of Science:

• Embryology
• Anatomy
• Skeletal Development

Background:

• Previous studies suggested significant differences between embryonic and adult skeletal relationships.
• The embryonic foot's development, particularly the hindfoot, has been a subject of debate.

Purpose of the Study:

• To investigate the skeletal relationships in the human embryonic hindfoot during stages 20-23.
• To compare embryonic hindfoot morphology with the adult condition.

Main Methods:

• Analysis of six serially sectioned human embryos (51-57 days postovulatory).
• Three-dimensional reconstructions using wax plate and transparency models.
• Microscopic examination of serial sections and comparison with adult skeletal material.

Main Results:

• Embryonic hindfoot skeletal relationships were found to be similar to the adult condition.
• The fibula projected distally to the tibia.
• The calcaneus was positioned below the talus, contrary to some previous reports.

Conclusions:

• The study challenges prior assertions of significant divergence between embryonic and adult hindfoot skeletal arrangements.
• Embryonic hindfoot development aligns closely with the adult anatomical configuration.