Note ventral anchoring of attachment site is at the most cranial extension of the septum transversum. Note the pleuroperitoneal fold on the medial side of the R common cardinal vein - this fold will form part of the diaphragm. Lateral extension of pulmonary mesenchyme is moulded to shape of coelomic canals. Prominent R pleuroperitoneal fold. Note dorsal extent of coelomic canals.
Oesophagus lumen reappears caudal to bifurcation.
L lungbud caudal to L atrium with attachment of pulmonary mesenchyme to septum transversum. Tracheal bifurcation dorsal to sinus venosus. Attachment of pulmonary mesenchyme to septum transversum. Olfactory epithelium lining roof of nasal cavity. Nasal capsule and septum.