POSTERIOR CEREBRAL ARTERY Anatomy
Basilar ... artery
Posterior cerebral artery
Occipital branch i
Cerebral Temporal Calcarine peduncle branch branch
Medial surface of right hemisphere
Undersurface of left cerebral hemisphere
— Occipital branch
The posterior cerebral arteries are the terminal branches of the basilar artery. Small perforating branches supply midbrain structures, choroid plexus and posterior thalamus. Cortical branches supply the undersurface of the temporal lobe - temporal branch; and occipital and visual cortex - occipital and calcarine branches.
Proximal occlusion by thrombus or embolism will involve perforating branches and structures supplied:
Midbrain syndrome - III nerve palsy with contralateral hemiplegia - WEBER'S SYNDROME. Thalamic syndromes - chorea or hemiballismus with hemisensory disturbance.
Occlusion of cortical vessels will produce a different picture with visual field loss (homonymous hemianopia) and sparing of macular vision (the posterior tip of the occipital lobe, i.e. the macular area, is also supplied by the middle cerebral artery).
Posterior cortical infarction in the dominant hemisphere may produce problems in naming colours and objects.
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