Embryology and Development — Flashcards

If the developing embryo splits in the 2-cell stage (0-4 days), the twins will be _____ and diamniotic (# of chorions and # of amniotic sacs)

Each otic vesicle divides into a dorsal component called _____ and a ventral component called pars inferior.

The _____ part of the left anterior cardinal vein and the transverse anastomosis becomes the left brachiocephalic vein

The _____ period of lung development occurs from weeks 5 to 17

Anterior opening of the neural tube (cranial neuropore) closes by day _____ and the posterior opening (caudal neuropore) closes by day 28.

The formation of the _____ from the epiblast is the indicator that gastrulation has started.

From the umbilical vein, blood is conducted into the _____ via the ductus venosus, which bypasses hepatic circulation

The _____ (left) and proximal part of the right subclavian artery (right) are derivatives of the 4th aortic arch

_____ part of the tongue and the epiglottis is derived from the third swelling in the posterior part of the 4th arch

_____ defects arise due to failure of the neuropores to fuse by the 4th week of pregnancy