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B6: Note the ventral compression of the pharynx into a plate and the dense mesenchyme laterally. Two atria and midline truncus arteriosus of heart. Thick nasal placode.
DEVELOPMENT OF RESPIRATORY SYSTEM & GIT1
B6: Further compression of ventral part of pharynx to form a fused epithelial lamina - the anlage of the vocal fold. Note surrounding dense mesenchyme. Nasal placode.
DEVELOPMENT OF THE NERVOUS SYSTEM
B1-7: Forebrain.
Development of the Visual System
B6: Hyaloid vessels ventral to optic stalk. Optic mesenchyme (mesectoderm) arising directly from epithelium of dorsal surface of optic cup. Nasal placodes.
