Stage 19: c. 46 days

Ectoderm: sensory placodes, lens pit, otocyst, nasal pits moved ventrally, fourth ventricle of brainMesoderm: heart prominence, ossification continuesHead: forebrain, eye, external acoustic meatusBody: straightening of trunk, heart, liver, umbilical cord

Stage 20: c. 49 days

Ectoderm: sensory placodes, lens pit, otocyst, nasal pits moved ventrally, fourth ventricle of brain

Mesoderm: heart prominence, ossification continues

Head: forebrain, eye, external acoustic meatushearing -

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