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B5: Ventral ends of mandibular processes, maxillary process on one side and nasal placode on other side. Optic cup connected by optic stalk to wall of forebrain (continuous lumen). Note that pharynx has become compressed laterally (compare B4).
DEVELOPMENT OF RESPIRATORY SYSTEM & GIT1
DEVELOPMENT OF THE NERVOUS SYSTEM
B1-7: Forebrain.
Development of the Visual System
B5: Continuity of optic ventricle and single forebrain ventricle via optic stalk. Note proximity of eye to nasal placode (R).