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B3: Aortic sac with emerging 3rd arch artery. Thyroid cords. Arches l- 4. 4th arch arteries.
DEVELOPMENT OF RESPIRATORY SYSTEM & GIT1
B3: Rudimentary thyroid ventral to aortic sac (also seen in B2, ventral to the hypopharyngeal eminence).
DEVELOPMENT OF THE NERVOUS SYSTEM
B1-7: Forebrain.
Development of the Visual System
B2: Optic cup with optic ventricle. Note unequal thickness of walls of optic cup (inner wall; sensory retina: outer wall; pigment epithelium). Lens pit (incorrectly labelled in microfiche only :"Optic placode"). Note position of eye with respect to maxillary arch. Hyaloid vessels near ventral margin of optic cup.
