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Is orbital volume associated with eyeball and visual cortex volume in humans?
1Department of Anthropology, University of Oxford , 64 Banbury Road, Oxford OX2 6PN , UK .
Annals of Human Biology
|July 25, 2013
Summary
Orbital volume in humans scales with latitude, suggesting larger orbits correlate with larger eyes and visual cortices. This study confirms orbit size accurately reflects visual system component volumes.
Area of Science:
- Human anatomy and visual neuroscience.
Background:
- Orbital volume in humans increases with latitude.
- Mammalian visual system scaling suggests larger orbits correlate with larger eyes and visual cortices at higher latitudes.
- Larger eyes may enhance visual acuity and sensitivity in low-light conditions.
Purpose of the Study:
- To validate if orbital volume accurately indexes eyeball and visual cortex volumes in humans.
Main Methods:
- Structural Magnetic Resonance Imaging (MRI) was used to measure orbital, eyeball, brain, and visual cortex volumes.
- Measurements included 88 individuals for eye/orbit and 99 for brain/visual cortex.
- Facial dimensions and foramen magnum area were also assessed.
Main Results:
- A significant positive linear relationship was observed between orbital and eyeball volumes.
- Eyeball volume showed a positive linear relationship with visual cortex grey matter volume.
- These visual system component scalings were independent of overall brain volume.
Conclusions:
- In humans, visual system components (orbit, eye, visual cortex) scale independently of total brain size.
- Orbital volume serves as a reliable index for eyeball and visual cortex volumes.
- The findings support the hypothesis that larger high-latitude orbits correspond to larger visual cortices.
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