Posterior Cerebral Artery: Difference between revisions
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* 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 | ||
<br clear="all"> | |||
== P1 segment == | |||
<table class="wikitable" width="100%"> | |||
<tr> | |||
<th width="30%">P1 Segment</th> | |||
<th>Feature</th> | |||
</tr> | |||
<tr> | |||
<td>Posterior thalamoperforator arteries</td> | |||
<td>From the basilar artery and P1, travels through the posterior perforated substance behind the mamillary bodies<br>Supply: thalamus, hypothalamus, subthalamus, and midbrain (cranial nerves III and IV)</td> | |||
</tr> | |||
<tr> | |||
<td>Medial posterior choroidal arteries</td> | |||
<td> | |||
* Travels anteromedially along the roof of the third ventricle | |||
* Supply: midbrain tectum, posterior thalamus, pineal gland, and tela choroidae of the third ventricle</td> | |||
</tr> | |||
<tr> | |||
<td>Meningeal branches</td> | |||
<td>Supply: tentorium and the falx</td> | |||
</tr> | |||
</table> | |||
= Vascular territory = | = Vascular territory = | ||
Revision as of 14:41, 3 March 2024
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
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 |
|
| Meningeal branches | Supply: tentorium and the falx |
Vascular territory
- parietooccipital sulcus (medial) and inferior temporal sulcus (lateral)