배아(Streeter 연령균 XXI)의 1예
A Human Embryo of Streeter Age Group XXI

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지제근; 이지은; 이혜경
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서울대학교 의과대학
Seoul J Med 1983;24(2):267-279
A human embryo that is thought to belong to
age group XXI of Streeter's developmental horizon is described. This embryo was obtained incidentally
from the hysterectomy specimen to a 32 years old
woman who was operated for ovarian cystic teratomao
Tbe length of the embryo was 20. 5mm. It was
serially sectioned in 7I'm thickness and reconstructed
with 141 section slides. This embryo was characterized
by the cornea consisting of three layered
compact mesodermal sheet, ependymal remnant
in the optic nerve, turning down of the cochlear
tip, threadlike stalk of the hypophysis, blind sac of
the vomeronasal organ, the submandibular gland
with secondary branching of its duct, spoon-shaped
Bowman's capsule and clearing center in cartilage
of bones. From the above findings, we concluded that
this embryo belonged to age group XXI of Streeter's
dcvelopm ental horizon.
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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. 24 No.2 (1983)
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