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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
C7: Bifurcation of trachea into L, R lung buds. Junction of L common cardinal vein and L "horn" of sinus venosus. Note dorsal extent of coelomic canals. Oesophagus lumen reappears caudal to bifurcation. Distinct R (smaller on L) pleuroperitoneal fold below the common cardinal vein.
DEVELOPMENT OF THE NERVOUS SYSTEM
C7: Note obvious dorsal root ganglia and pathway of nerves leaving ganglia. Spinal cord has enlarged ventral horns (motor neurons).
