<prompt> Cleft lip is due to the nonfusion ofMaxillary process with lateral nasal processMaxillary process with medial nasal processMaxillary process with mandibular processAll of the above  <response>: Human embryology Tenth edition Inderbier Singh Page no:160 Harelip: when one or both maxillary process do not fuse with the medial nasal process, this gives rise to defect in the upper lip. These may vary in degree and unilateral or bilateral 