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Fl: Mesentery with midgut loop sectioned in 2 places. Note body wall jelly extending towards sacral region on one side.
F1-F6: Gut loop extending caudally "up" into sacral region, attached by a dorsal mesentery. Separation of dorsal aorta.
F1: Junction of urogenital sinus and midline allantois. Note how this junction lies in the anterior body wall, now separated from the hindgut by the intraembryonic coelom. umbilical artery to one side (missing - damaged - on other side), and umbilical veins further to the side.
DEVELOPMENT OF THE NERVOUS SYSTEM
F1: Spinal cord has enlarged ventral horns (motor neurons).
DEVELOPMENT OF THE MUSCULOSKELETAL SYSTEM
F1,F2: Caudal limit of forelimb. Broad extensor surface. Dense mesenchyme of hindlimb. Note lumbar somites, somitocoeles.
