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B2: Rathke's pouch. Dorsal part of pharyngeal cavity. 3rd arch artery. 4th arch artery joining to dorsal aorta. 2nd and 3rd pouches with their corresponding grooves. Optic cup and lens placode. Thyroid rudiment (cords) near midline. Note that the opening to the pharynx is located between B l and B2 - the site of the former buccopharyngeal membrane.
DEVELOPMENT OF RESPIRATORY SYSTEM & GIT1
B1,B2: Pharynx. Crest in ventral floor of pharynx formed by fusion of 3rd pharyngeal arches = hypopharyngeal eminence (precursor of root of tongue). Rathke's pouch = rudimentary adenohypophysis.
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.
