S-Space College of Medicine/School of Medicine (의과대학/대학원) Dept. of Medicine (의학과) The Seoul Journal of Medicine The Seoul Journal of Medicine Vol. 26 No.2 (1985)
A Human Embryo of Streeter Age Group XX
사람배아(Streeter 연령군 XX)의 1예
- Chi, Je G.; Kim, Young Tae
- Issue Date
- Seoul J Med, Vol.26 No.3, pp. 297-307
- A human embryo was obtained from a total hysterectomy specimen of a
31-year old woman. This embryo was serially sectioned and studied with special reference to
its developmental stage.
The developmental characteristics of the eight key organs in this embryo corresponded well
to the age group XX. The embryo was 23 mm in crown-rump length, and was 55 days old
on the basis of the last menstrual period. The digestive tract was well-developed, and the
dorsal and ventral pancreases were thought to be fused with each other. The development of
the respiratory system was in normal commencement, having branched more than three times.
The mesonephroi and metanephroi were also well-developed and the lumen of the ureter was
visible. The heart was composed of four chambers and almost all of the valves present in the
normal adult heart were also noted. The telencephalon was relatively small, and the ventricles
of the brain were narrow.