Visual Field Defect: Macular Sparing
- * According to the vascular model for macular sparing, the posterior cerebral artery supplies the occipital cortex except for the occipital pole, which the middle cerebral artery supplies. Therefore, in the setting of posterior cerebral artery infarction, the middle cerebral artery maintains perfusion of the occipital pole, which spares macular cortical representation.
- Additionally, or alternatively, macular sparing is argued to occur from redundant macular representation in both occipital cortices in much the same way that auditory information is redundantly localized to both transverse temporal gyri (of Heschl).