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CRANIOFACIAL DEVELOPMENT AND PHARYNX
C1-C7: Beginning of trachea, oesophagus. Nasal placodes (nasal pit forming on one side). Forebrain. note proximity of nasal pit to prosencephalon (future site of olfactory nerve). In C2-C4, identify the medial and lateral nasal swellings.
DEVELOPMENT OF RESPIRATORY SYSTEM & GIT1
C3: Common cardinal vein in the posterior wall of the intraembryonic coelom - the pleuropericardial folds which contribute later to the formation of the pleura and pericardium. L. nasal pit. In C4, junction of R common cardinal vein with dorsal wall of sinus venosus.
DEVELOPMENT OF THE NERVOUS SYSTEM
C1-5: Forebrain. Also identify the sulcus limitans separating the alar and basal plates.
