Posterior cerebral artery
Updates to Article Attributes
Body
was changed:
The posterior cerebral arteries (PCA) are the terminal branches of the basilar artery and supply the occipital lobes and posteromedial temporal lobes.
Summary
- origin: terminal branches of the basilar artery
- course: from basilar towards occiput
- main branches
- supply: occipital lobes and posteromedial temporal lobes
Gross anatomy
The PCA is divided into four segments:
- P1: from it origin at the termination of the basilar artery to posterior communicating artery (PCOM), within interpeduncular cistern
- P2: from the PCOM around the mid-brain, divided into P2A (anterior) and P2P (posterior) sub-segments; P2A is within crural cistern which then bridges to the P2P segement in ambient cistern (thus ambient segment)
- P3: quadrigeminal segment (segment with the quadrigeminal cistern)
- P4: cortical segment (e.g. calcarine artery, within the calcarine fissure)
Branches
- posterior communicating artery
- choroidal branches (from P2)
- perforators
- anterior thalamoperforator (from PCOM)
- posterior thalamoperforator (from P1)
- thalamogeniculate perforator (from P2)
- peduncular perforator (from P2)
- circumflex (long and short)
- cortical branches
- temporal branches
- anterior temporal artery
- posterior temporal artery
- lateral occipital artery
- anterior inferior temporal artery
- middle inferior temporal artery
- posterior inferior temporal artery
- medial occipital artery
- calcarine artery
- parieto-occipital artery
- splenial artery
- temporal branches
Variant anatomy
- PCA fenestration: rare
- fetal origin of PCA: unilateral incidence 10%, bilateral incidence 8%
-<a href="/articles/medial-posterior-choroidal-artery">medial</a> and <a href="/articles/lateral-posterior-choroidal-arteries">lateral posterior choroidal arteries</a>- +<a href="/articles/medial-posterior-choroidal-artery">medial</a> and <a title="lateral posterior choroidal arteries" href="/articles/lateral-posterior-choroidal-artery">lateral posterior choroidal arteries</a>
-<li><a href="/articles/lateral-posterior-choroidal-artery">lateral posterior choroidal arteries</a></li>