Embryology and Development — Flashcards

Flashcard 21: The _____ artery and hyoid artery are derivatives of the 2nd aortic arch

Answer: stapedial

Flashcard 22: Y-shaped sutures are characteristic of the _____ nucleus of the lens.

Answer: fetal

Extra: In the fetal nucleus, the anterior suture is an upright 'Y' and the posterior suture is an inverted 'Y'. The embryonic nucleus has no sutures, while the infantile and adult nuclei have more complex star-shaped (dendritic) sutures.

Flashcard 23: _____ is a congenital renal disease characterized by bifurcation of the ureteric bud before it enters the metanephric mesenchyme

Answer: Duplex collecting system

Flashcard 24: The _____ period of lung development occurs from weeks 16 to 25

Answer: canalicular

Flashcard 25: In _____ ossification, osteoblasts and osteoclasts replace cartilage with a matrix of woven bone and then remodel to lamellar bone.

Answer: endochondral

Flashcard 26: During the _____ period (lung development), the endodermal tubules form the terminal bronchioles

Answer: pseudoglandular

Flashcard 27: The formation of the _____ from the epiblast is the indicator that gastrulation has started.

Answer: primitive streak

Flashcard 28: From the umbilical vein, blood is conducted into the _____ via the ductus venosus, which bypasses hepatic circulation

Answer: IVC

Flashcard 29: The embryonic _____ gives rise to the smooth part of the left atrium

Answer: primitive pulmonary vein

Flashcard 30: The allantois becomes the _____, which is a duct between the fetal bladder and the umbilicus

Answer: urachus