Abstract
Objective
The aim of this study was to describe the anatomical features encountered in the parietal foramen in a series of 178 human bones and 123 head MRI examinations. A cadaveric specimen was also dissected to demonstrate the trajectory of a superficial scalp vein through the parietal foramen as far as the dura mater. A literature review was performed regarding prevalence of parietal foramen in different populations.
Methods
Totally, 178 paired adult bones were used to investigate the presence, shape and number of the parietal foramina. In addition, 123 brain MRI examinations were also studied.
Results
The parietal foramina were encountered in 75/89 (84.3%) skulls [32/38 (84.2%) in women vs. 43/51 (84.3%) in men, p > 0.05]. The parietal foramen was present bilaterally in 44.73% of females and 54.9% of males. Regarding unilaterality of the parietal foramen, a right or left laterality was observed in female 21% right versus 18% left; and 16% versus 14% (left) in males (p > 0.05). The accessory parietal foramen was present in the right parietal in 2.6% and in 7.9% on the left side of the females, while 5.9% and 3.9% of the males on the right or left sides, respectively. The parietal foramina located in the proximity of the sagittal suture (male 7.1 ± 2.5 mm vs. female, 7.4 ± 2.7 mm). There was a positive correlation between the right and left parietal foramina regarding the distance from the median line. The distance from a foramen to the contralateral one was 16 ± 4 mm in men and 18 ± 5 mm in women, respectively (p > 0.05).
Conclusion
No major differences were encountered between sexes regarding the anatomical features of parietal foramen.
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Acknowledgements
We are grateful to the Human Anatomy Laboratory of the Federal University of Pernambuco, which provided materials that were essential to carry out the study.
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MRSF, CPM and MMV conceived and designed the analysis; MRSF, AMBQL, CPM and MMV collected the data; APOG, PTMBQL and AMBQL contributed data or analysis tools; MRSF, PTMBQL and MMV performed the analysis; MRSF and MMV wrote the paper.
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All stages of this study were carried out in accordance with the guidelines of the National Research Ethics Commission and were approved by the Research Ethics Committee involving human beings at the Federal University of Pernambuco through the protocol CAAE: 79464917.6.0000.5208.
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de Souza Ferreira, M.R., Galvão, A.P.O., de Queiroz Lima, P.T.M.B. et al. The parietal foramen anatomy: studies using dry skulls, cadaver and in vivo MRI. Surg Radiol Anat 43, 1159–1168 (2021). https://doi.org/10.1007/s00276-020-02650-0
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DOI: https://doi.org/10.1007/s00276-020-02650-0