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A Human Embryo of Streeter Age Group XV : 사람배아(Streeter 연령군 XV)의 1예

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Authors

Chi, Je G.; Kang, Yun Kyung

Issue Date
1988-06
Publisher
Seoul National University College of Medicine
Citation
Seoul J Med, Vol.29 No.2, pp. 187-194
Keywords
Human embryoStreeter's developmental horizon
Abstract
A human embryo considered to belong to stage XV of Streeter's developmental
horizon is presented. The embryo was obtained surgically from tubal pregnancy. The crownrump(
CR) length was 8.5 rom. A total of 600 serial sections were made through the frontal
plane and the following distinguishing features of the key organs were found. There was closure
of the lens vesicle, evagination of the endolymphatic duct, overgrowth of the second
branchial arch, well formed endocardial cushions, secondary bronchial subdivisions, ureteric
bud inducing early metanephric blastema, and the appearance of ventral pancreatic bud. Beginning
of pigmentation in the outer layer of the retina was the only finding that did not strictly
meet the criteria of stage Xv.
Authors classified the embryo in the late age group XV of Streeter's developmental horizon.
ISSN
0582-6802
Language
English
URI
https://hdl.handle.net/10371/6379
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