POSTERIOR CEREBRAL ARTERY

The Posterior Cerebral Artery (PCA) supplies the occipital lobe, the inferior part of the temporal lobe, and various deep structures including the thalamus and the posterior limb of the internal capsule.

Structures supplied by the PCA:

  • Superficial Branch
  • Deep Branch
  • Clinical Syndromes of PCA Territories

OCCIPITAL LOBE

Primary and secondary visual areas. Functions in the sensation and interpretation of visual input.

SPLENIUM OF
CORPUS CALLOSUM

Carries commissural fibers connecting right and left visual association cortices.

THALAMUS

Relay center for descending and ascending information. Functions in the integration between cerebral cortex and the rest of the central nervous system.

INTERNAL CAPSULE
(Posterior Limb)

Contains descending fibers of the lateral and ventral corticospinal tracts.

LOCATION OF INFARCT

Left PCA






Right PCA

DEFICITS

Right homonymous hemianopsia due to damage to left visual cortex in the occipital lobe. Extension to the splenium of the corpus collusom therefore interfering with comunication between the two visual association areas can cause alexia without agraphia. Larger infarcts involving the internal capsule and thalamus may cause right hemisensory loss and right hemiparesis due to disruption of the ascending and descending information passing through these structures.

Left homonymous hemianopsia due to damage to right visual cortex in the occipital lobe. Larger infarcts involving the internal capsule and thalamus may cause left hemisensory loss and left hemiparesis due to disruption of the ascending and descending information passing through these structures.