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 urogenital ridge has 2 parts, the _____ and the nephrogenic cord

Answer: genital ridge

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

Answer: canalicular

Flashcard 26: In _____ ossification, osteoblasts and osteoclasts replace cartilage with a matrix of woven bone and then remodel to lamellar bone.

Answer: endochondral

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: By the end of the third week, neural _____ grow over the midline and fuse to form the neural tube

Answer: folds