배아 (Streeter 연 령 군 XXI) 의 1 예
A Human Embryo of Streeter Age Group XXI

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서울대학교 의과대학
Seoul J Med 1984;25(4):623-632
A human embryo of age group XXI of Streeter’s
developmental horizon is described. The embryo was
。b t a i n ed from the right uterine tube of a 42-year-old
woman who was operated for an ectopic pregnancy
in 1980. The estimated age of the embryo was 45
days, and CR length was 19mm. The embryo was
‘erially cut , and 493 sagittal sections were made in
4μm thickness.
Summary descriptions and scores of eight key-organs
were as follows
1. The cornea was delaminating into three layers
(4 points)
2. The optic stalk had no lumen , but ependymal
remnant was presen t. (5 points)
3. Distal tip of cochlea was turning down. (4
4. The stalk of adeno- hypophysis was threadlike.
(4 points)
5. The vomero-nasal organ was a blind sac with
its small opening. (3.5 points)
6. The submandibular gland showed simpIe primary
branching. (5 points)
7. The kidney had many spoon-sha~ed capsules
and some S·shaped ones. (4 points)
8. Osteoblasts were forming in bng bones. (5
Taking all these things into consideration, the
embryo was believed to fall into age group XXI.
Total score was 34.5 after adding all the points above,
and this also corresponded to the same age group
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Medicine (의학과)The Seoul Journal of MedicineThe Seoul Journal of Medicine Vol. 25 No.4 (1984)
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