Embryology

THE 3rd WEEK OF DEVELOPMENT

TRILAMINAR GERM DISC
LEC 2 EMBRYOLOGY DR.MAAN ALKHALISY

IMPLANTATION SITE AT THE END OF 2nd WEEK

-THE 3rd WEEK OF DEVELOPMENT

-FORMATION OF PRIMITIVE STREAK &PRIMITIVE NODE





-IMVAGINATION OF EPIBLAST CELL THROUGH PRIMITIVE STREAK
-GHANGE OF SHAPE OF EPIBLAST
-FORMATION OF THREE LAYAERS

-FORMATION OF NEURENTERIC CANAL

-FORMATION OF CLOACAL MEMBRANE &OROPHARYNGEAL
MEMBRANE
-FORMATION OF ALANTOIS

-FORMATION OF NOTOCHORDAL PLATE

-FORMATION OF NOTOCHOR
-FORMATION OF THREE GERM LAYAERS





-AT THE END OF 3rd WEEK :
APPERANCE OF EMBRYO WITH SURROUNDING
VILLI

-FORMATION OF VILLI

-PRIMITIVE PLACENTA

-PRIMITIVE UMBILICAL CORD

THANK YOU