UNSW Embryology Early Human Stages Carnegie Stage 23 Labelled	Embryology Homepage
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This material is from the Kyoto Collection and is reproduced with the permission of Prof. Kohei Shiota for tutorial/revision purposes and cannot be reproduced electronically or in writing without permission.

Stage 23 (day 56) scalp vascular plexus eylid eye nose auricle of external ear mouth sholder arm elbow wrist toes separated sole of foot umbilical cord

External Feautures	Internal Features
Head bending and rounding. Neck and body mature shape. Limbs increasing in length Obvious knee and elbow flexures. Cranial vascular plexus has extended and forms "V" shape at skull vertex.	Eye corneal body 3 x thickness of epithelium. vascular canal in optic nerve. Ear Cochlea has turned second time. enlargement of auricle. Nose Vomeronasal organ is a narrow canal in a tapering duct and has begun regression. CNS no hypophyseal stalk angioblasts and capillaries in anterior lobe vasculature. Kidney metanephros has convoluted glomeruli with short and long tubules. Cartliage and Bone