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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
C6: Lateral extension of pulmonary mesenchyme is moulded to shape of coelomic canals. R common cardinal draining directly into sinus venosus; L common cardinal vein with prominent L pleuropericardial fold. Oesophagus lumen obliterated (common site of oesophageal atresia and/or tracheo-oesophageal fistula). Prominent R pleuroperitoneal fold.
DEVELOPMENT OF THE NERVOUS SYSTEM
C6: Forebrain. Tip slice of anterior of forebrain.
