Embryology and Development — Flashcards

Flashcard 31: The _____ artery and hyoid artery are derivatives of the 2nd aortic arch

Answer: stapedial

Flashcard 32: During the _____ period (lung development), the terminal sacs form the adult alveoli

Answer: alveolar

Flashcard 33: 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 34: Two common first arch syndromes are _____ syndrome and pierre robin sequence

Answer: treacher-collins

Flashcard 35: From the umbilical vein, blood is conducted into the _____ via the ductus venosus, which bypasses hepatic circulation

Answer: IVC

Flashcard 36: The _____ period of lung development occurs from weeks 5 to 17

Answer: pseudoglandular

Flashcard 37: Anterior opening of the neural tube (cranial neuropore) closes by day _____ and the posterior opening (caudal neuropore) closes by day 28.

Answer: 25

Flashcard 38: The formation of the _____ from the epiblast is the indicator that gastrulation has started.

Answer: primitive streak

Flashcard 39: Each otic vesicle divides into a dorsal component called _____ and a ventral component called pars inferior.

Answer: pars superior

Flashcard 40: _____ is the abnormal opening of the penile urethra on the ventral surface of the penis due to failure of urethral folds to fuse

Answer: Hypospadias