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D1: Oesophagus/stomach junction. R lung bud prominent. (L lung bud is more cranial, therefore R primary bronchus is more vertical than the left - cf. Gross Anatomy). note ventral anchoring of pulmonary mesenchyme to the septum transversum, in which is also embedded the sinus venous. Coelomic canals.
DEVELOPMENT OF THE NERVOUS SYSTEM
D1: Note obvious dorsal root ganglia and pathway of nerves leaving ganglia. Spinal cord has enlarged ventral horns (motor neurons).
DEVELOPMENT OF THE MUSCULOSKELETAL SYSTEM
D1: Surface bulge of a somite, either side of neural tube. Somite components: dermatome, myotome, sclerotome. Notochord. Paired dorsal aortae, with inferior cardinal veins (lateral). Dorsal root ganglion. Spinal nerve passing between sclerotome and myotome.
Dl-D3: Dermatome, myotome, sclerotome. Dorsal root ganglia. Notochord. Note the dorsal segmental branches of the dorsal aortae and the inferior cardinal veins. In the walls of the neural tube, note the alar and basal laminae of cells, sulcus limitans.
