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From Embryology

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Fig. 57. Human Embryos

The embryo Meyer 302 of Robert Meyer's collection (Fig. 57) shows a distinct depression between the root of the nose and the forehead.

The pinna, tragus, and antitragus are evident; and while the concha is still widely open it shows a tendency to deepen. Early indications of the eyelids are to be seen.

The nape flexure is still very evident, but it forms an obtuse angle, and the depression of the dorsal line just below it is less marked.

The nose and mouth have both separated from contact with the pericardium ; the mouth is slightly open and the mandible lies close upon the breast.

The shoulder is distinctly marked off from the body, the upper arm makes an angle with the forearm, and the elbow projects strongly.

The hand plate is beginning to turn ventrally, and the finger anlagen are very distinct; their tips are becoming free and the thumb is strongly abducted. In the lower limb the knee is very distinct and anlagen of the toes are appearing on the foot plate.

The dorsum of the foot is not yet marked off from the crus.

KM Figure Links: The Germ Cells | Segmentation | First Primitive Segment | Gastrulation | External Form | Placenta | Axial Skeleton | Limb Skeleton | Skull | Muscular System

   Manual of Human Embryology I 1910: The Germ Cells | Fertilization | Segmentation | First Primitive Segment | Gastrulation | External Form | Placenta | Human Embryo and Fetus Age | Ovum Pathology | Integument | Skeleton and Connective Tissues | Muscular System | Coelom and Diaphragm | Figures | Manual of Human Embryology 1 | Manual of Human Embryology 2 | Franz Keibel | Franklin Mall | Embryology History

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