Embryology and Development — Flashcards

In the developing ovaries, primordial germ cells produce _____ by mitotic divisions until gestational weeks 20 to 24

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

The _____ - 4th branchial clefts form temporary cervical sinuses, which are obliterated

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

The _____ artery is a derivative of the 1st aortic arch

Development of notochord:The cells in the primitive knot multiply and pass _____ in the midline between the ectoderm and endoderm, forming the notochordal process

Hint: cranial/caudal

_____ is the persistence of thyroid tissue at the base of the tongue (due to failure of migration)

The _____ on the fetal side of the placenta is also known as Langhan's layer

During the _____ period of lung development, airways increase in diameter

The ear ossicles undergo _____ ossification which completes by 25th week of gestation

Hint: membranous/enchondral