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F1-F6: Gut loop extending caudally "up" into sacral region, attached by a dorsal mesentery. Separation of dorsal aorta.
F4: Attachment of mesentery to sacral part of dorsal abdominal wall. I-E coelom (now cut deep to its opening into the extraembryonic coelom). Hindgut. Sacral dorsal aortae.
DEVELOPMENT OF THE NERVOUS SYSTEM
F2: 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.
