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E2: Duodenum. Vitelline veins. Coelomic canals.
E2: Distal region of urogenital sinus and rectum, still receiving lateral mesonephric ducts. (The blind end of the sinus occurs between E2 and E1). Sacral neural tube. Somites and somitocoeles.
DEVELOPMENT OF THE NERVOUS SYSTEM
E2: Spinal cord has enlarged ventral horns (motor neurons).
DEVELOPMENT OF THE MUSCULOSKELETAL SYSTEM
E1-E3: Note blood vessels in limb fold mesenchyme, and pale-staining nerves at root of limb (E1).
