results in development of rhombomere development rhombomere 1 development GO:0021567 biological_process The process whose specific outcome is the progression of rhombomere 1 over time, from its formation to the mature structure. Rhombomeres are transverse segments of the developing rhombencephalon. Rhombomeres are lineage restricted, express different genes from one another, and adopt different developmental fates. Rhombomeres are numbered in anterior to posterior order. anatomical structure development rhombomere 1