Fig. 14. Interactions and relationships between the neural crest, placodes, gene expression patterns, brain and motor nerves, and paraxial mesoderm muscles. (acc., accessory; abd., abducens; L.R., lateral rectus; D.R., dorsal rectus; D.O., dorsal oblique (superior oblique); M.R., medial rectus; V.O., ventral oblique (inferior oblique); V.R., ventral rectus)