A segment of the developing hindbrain[ZFA]. In the vertebrate embryo, a rhombomere is a transiently divided segment of the developing neural tube, within the hindbrain region (a neuromere) in the area that will eventually become the rhombencephalon. The rhombomeres appear as a series of slightly constricted swellings in the neural tube, caudal to the cephalic flexure.[WP]. [ http://zfin.org/curator http://en.wikipedia.org/wiki/Rhombomere ]