embryonic pole

embryonic pole

the area of contact between the embryoblast and the overlying polar trophoblast of the blastocyst.

embryonic pole

the area of the blastocyst where the embryoblast and the trophoblast are in contact. The embryoblast attaches to the endometrial epithelium at this pole.

em·bry·on·ic pole

(em'brē-on'ik pōl)
The area of contact between the embryoblast and the overlying polar trophoblast of the blastocyst.
References in periodicals archive ?
Of greater concern, in examinations 24 hours after women took the drugs, abdominal ultrasound missed three of 34 retained gestational sacs and four of 14 instances of cardiac activity in an embryonic pole (a very early sign of a developing embryo).
Any of the following three signs on transvaginal ultrasound indicate a nonviable pregnancy: no yolk sac in a 10-mm gestational sac, no embryonic pole in a 20-mm gestational sac, or no cardiac activity with a crown-rump length of 5 mm.
Obstetric textbooks suggest a range of sac sizes for the first two signs: no yolk sac in a 6- to 13-mm gestational sac or no embryonic pole in a 16- to 25-mm gestational sac.