Embryology and Development — Flashcards

The embryonic _____ gives rise to the smooth part of the right atrium

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

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

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

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

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

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

The _____ and 4th branchial arches form the posterior one-third of the tongue