Kalmar "myelencephalon" tana nufin mafi girma na baya da caudal na kwakwalwar kwakwalwa, wanda ke da alhakin sarrafa yawancin ayyuka masu mahimmanci na jiki, kamar numfashi, bugun zuciya, da hawan jini. Har ila yau, wani lokaci ana kiranta da medulla oblongata.
