The term soil pipe is often used to designate cast-iron pipe of any size and for any purpose in connection with the plumbing system. The latter is the sense in which it will be referred to in the consideration of the present subject. Plate XIII.
Posterior communicating artery. In human anatomy, the left and right posterior communicating arteries are arteries at the base of the brain that form part of the circle of Willis. Each posterior communicating artery connects the three cerebral arteries of the same side. Anteriorly, it connects to the internal carotid artery (ICA) prior to the terminal bifurcation of the ICA into the anterior cerebral artery and middle cerebral artery.
The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: 1  Anterior cerebral artery (left and right). 2  Anterior communicating artery. 3  Internal carotid artery (left and right).4  Posterior cerebral artery (left and right). 5  Posterior communicating artery (left and right).Redirected from Circle of willis). The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures.