Posterior cerebral artery

 PCA

Supplies:

PCA is usually of dominant basilar origin but a minority (up to 30%) will have fetal origin i.e. dominant PComm, and a mixture of both is also possible. 

4 Segments: 

P1 (precommunicating segment), 

P2 (postcommunicating segment), 

(NB anterior P2A or crural segment and posterior P2P or ambient segment)

P3 (quadrigeminal segment)

P4 (calcarine segment)

Reminder of basal cisterns 

Crural not shown but PCA demonstrated within basal cisterns and with relationship to midbrain

PCA branches