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D7,E1: Gall bladder, duodenum.
DEVELOPMENT OF THE NERVOUS SYSTEM
D7: Spinal cord has enlarged ventral horns (motor neurons).
DEVELOPMENT OF THE MUSCULOSKELETAL SYSTEM
D6-,D7: Limb folds and fossae. Greatest thickening of the ectoderm is at apex of the limb fold: the apical ectodermal ridge. The mesenchyme of the limb is densest under the ectoderm. Note the narrow distance between the ectoderm of the axillary fossa and the serosa of the body cavity. The limb fold has distinct flexor and extensor surfaces: the flexor surface is narrower and has thicker ectoderm. Note blood vessels close to flexor surface
