Posterior Cerebral Artery: Difference between revisions

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[[File:Posterior cerebral artery.jpg|thumb]]
{{NoteBox|secondary}}<strong>Related pages</strong>
* [[Fetal PCA]]
{{NoteBoxEnd}}
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= Vascular territory =
* Parietooccipital sulcus (medial) and inferior temporal sulcus (lateral)
 
= Anatomical segments =
= Anatomical segments =
* P1: PCA from the origin to posterior communicating artery (AKA mesencephalic, precommunicating, circular, peduncular, basilar...). The long and short circumflex and thalamoperforating arteries arise from P1
[[File:PCA Segments.png|thumb]]
* P2: PCA from origin of PComA to the origin of inferior temporal arteries (AKA ambient, post-communicating, perimesencephalic), P2 traverses the ambient cistern, hippocampal, anterior temporal, peduncular perforating, and medial posterior choroidal arteries arise from P2
* P1: PCA from the origin to [[Posterior Communicating Artery|posterior communicating artery]] (AKA mesencephalic, precommunicating, circular, peduncular, basilar...). The long and short circumflex and thalamoperforating arteries arise from P1
* P2: PCA from origin of [[PComA]] to the origin of inferior temporal arteries (AKA ambient, post-communicating, perimesencephalic), P2 traverses the ambient cistern, hippocampal, anterior temporal, peduncular perforating, and medial posterior [[choroidal arteries]] arise from P2
* P3: PCA from the origin of the inferior temporal branches to the origin of the terminal branches (AKA quadrigeminal segment). P3 traverses the quadrigeminal cistern
* P3: PCA from the origin of the inferior temporal branches to the origin of the terminal branches (AKA quadrigeminal segment). P3 traverses the quadrigeminal cistern
* P4: segment after the origin of the parieto-occipital and calcarine arteries, includes the cortical branches of the PCA
* P4: segment after the origin of the parieto-occipital and calcarine arteries, includes the cortical branches of the PCA
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{| class="wikitable"
|-
! style="width: 30%; vertical-align: top;" | Segment
! style="width: 70%; vertical-align: top;" | Description
|-
| style="vertical-align: top;" | P1
| style="vertical-align: top;" | Arises from the basilar bifurcation and extends through the interpeduncular cistern to the junction with the [[Posterior Communicating Artery|posterior communicating artery]]
|-
| style="vertical-align: top;" | P2A (anterior)
| style="vertical-align: top;" | Runs in the crural cistern, extending from the PComA to the lateral mesencephalic sulcus where it becomes the P2P (posterior) segment
|-
| style="vertical-align: top;" | P2P (posterior)
| style="vertical-align: top;" | Runs in the ambient cistern, lateral to the midbrain
|-
| style="vertical-align: top;" | P3
| style="vertical-align: top;" | Runs in the quadrigeminal cistern, separated from the P2P segment by the tectal plate
|-
| style="vertical-align: top;" | P4
| style="vertical-align: top;" | Begins at the calcarine sulcus
|}
[[File:Posterior cerebral artery.jpg|thumb]]
= Branches of PCA =
== P1 segment ==
== P1 segment ==
<table class="wikitable" width="100%">
<table class="wikitable" width="100%">
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     <td>Medial posterior choroidal arteries</td>
     <td>[[Choroidal arteries|Medial posterior choroidal arteries]]</td>
     <td>  
     <td>  
* Travels anteromedially along the roof of the third ventricle
* Travels anteromedially along the roof of the third ventricle
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     <td>Lateral posterior choroidal artery</td>
     <td>[[Choroidal arteries|Lateral posterior choroidal artery]]</td>
     <td>
     <td>
* Main branch of P2, courses over the pulvinar and through the choroidal fissure
* Main branch of P2, courses over the pulvinar and through the choroidal fissure
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   </tr>
   </tr>
</table>
</table>
= Vascular territory =
* parietooccipital sulcus (medial) and inferior temporal sulcus (lateral)


[[Category:Neuroanatomy]]
[[Category:Neuroanatomy]]
[[Category:Vascular anatomy]]
[[Category:Vascular anatomy]]

Latest revision as of 22:53, 27 July 2025

Related pages


Vascular territory

  • Parietooccipital sulcus (medial) and inferior temporal sulcus (lateral)

Anatomical segments

  • P1: PCA from the origin to posterior communicating artery (AKA mesencephalic, precommunicating, circular, peduncular, basilar...). The long and short circumflex and thalamoperforating arteries arise from P1
  • P2: PCA from origin of PComA to the origin of inferior temporal arteries (AKA ambient, post-communicating, perimesencephalic), P2 traverses the ambient cistern, hippocampal, anterior temporal, peduncular perforating, and medial posterior choroidal arteries arise from P2
  • P3: PCA from the origin of the inferior temporal branches to the origin of the terminal branches (AKA quadrigeminal segment). P3 traverses the quadrigeminal cistern
  • P4: segment after the origin of the parieto-occipital and calcarine arteries, includes the cortical branches of the PCA


Segment Description
P1 Arises from the basilar bifurcation and extends through the interpeduncular cistern to the junction with the posterior communicating artery
P2A (anterior) Runs in the crural cistern, extending from the PComA to the lateral mesencephalic sulcus where it becomes the P2P (posterior) segment
P2P (posterior) Runs in the ambient cistern, lateral to the midbrain
P3 Runs in the quadrigeminal cistern, separated from the P2P segment by the tectal plate
P4 Begins at the calcarine sulcus

Branches of PCA

P1 segment

P1 Segment Feature
Posterior thalamoperforator arteries
  • From the basilar artery and P1, travels through the posterior perforated substance behind the mamillary bodies
  • Supply: thalamus, hypothalamus, subthalamus, and midbrain (cranial nerves III and IV)
Medial posterior choroidal arteries
  • Travels anteromedially along the roof of the third ventricle
  • Supply: midbrain tectum, posterior thalamus, pineal gland, and tela choroidae of the third ventricle
Meningeal branches Supply: tentorium and the falx

P2 segment

P2 Segment Feature
Lateral posterior choroidal artery
  • Main branch of P2, courses over the pulvinar and through the choroidal fissure
  • Supply: posterior portion of the thalamus and choroid plexus (temporal horn and atrium)
Thalamogeniculate arteries Medial geniculate body, lateral geniculate body, pulvinar, superior colliculus, and crus cerebri
Cortical branches
  • Inferior temporal artery group
  • Supply: inferior portion of the temporal lobe

P3 segment

P3 Segment Feature
Posterior temporal artery
  • Posterior temporal lobe, occipitotemporal and lingual gyri
  • Anterior temporal artery branch travels to the inferior temporal lobe to supply the inferior cortex.
  • Anastomoses with middle cerebral artery
Internal occipital artery
Parietooccipital artery
  • Located in the parietooccipital sulcus
  • Supply: posterior ⅓ of the medial hemispheres, cuneus, precuneus, superior occipital gyrus, and precentral and superior parietal lobules
  • Anastomoses with anterior cerebral artery
Calcarine artery
  • Located in the calcarine sulcus
  • Supply: occipital pole and the visual cortex
  • Anastomoses with middle cerebral artery
Posterior pericallosal artery
  • Supply: splenium of the corpus callosum
  • Anastomoses with anterior cerebral artery
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