|the plural of ramus|
ramus ra·mus (rā'məs)
n. pl. ra·mi (-mī')
Any of the primary divisions of a nerve or blood vessel.
A part of an irregularly shaped bone that is thicker than a process and forms an angle with the main body, especially the ascending part of the lower jaw that makes a joint at the temple.
Any of the primary divisions of a cerebral sulcus.