part of part of lacrimal apparatus epithelial bud eye epithelium lacrimal gland bud The single bud-like invagination of the conjunctival fornix epithelium at the temporal aspect of the eye that signals lacrimal gland formation (Int Rev Cytol. 1996;168:1-80. Cell biology of the harderian gland). UBERON:0022284 in mouse, the primary bud arises around E13.5 and extends caudally into the surrounding neural-crest derived periocular mesenchyme; between E15.5 and E16.5 the bud undergoes branching morphogenesis, forming both a major extra-orbital lobe and a minor intraorbital lobe EMAPA:35464