Generally, the left clavicle is slightly longer than the right clavicle in humans.
Clavicle Size Asymmetry: An Overview
Studies have shown a tendency for the left clavicle to be longer than the right. This difference is attributed to developmental variations established early in life. While not universally true for every individual, this trend appears consistently in research findings.
Research Findings on Clavicle Length:
- Prevalence: The left clavicle is longer in approximately 65% of males and 67% of females studied (52).
- Length Difference: In those where the left clavicle is longer, the average difference is around 4.55 mm in males and 3.14 mm in females (52).
- Cunningham et al.: Cunningham's textbook of anatomy also notes the common occurrence of left clavicle dominance.
Possible Explanations:
While the exact cause isn't definitively known, the asymmetry might stem from factors related to:
- Intra-uterine development: Early developmental differences.
- Handedness: Although there is a correlation between dominant arm and clavicle length, some studies suggest other factors are important.
Caveats:
It's crucial to remember that:
- Individual Variation: Not everyone will have a longer left clavicle. There are variations among individuals.
- Measurement Accuracy: Slight differences in measurement techniques could potentially influence results.
