Embryology and Development — Flashcards

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

Answer: stapedial

Flashcard 22: _____ 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

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 embryonic _____ differentiates into renal structures from the glomerulus through the DCT

Answer: metanephric mesenchyme (blastema)

Flashcard 28: 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 29: The formation of the _____ from the epiblast is the indicator that gastrulation has started.

Answer: primitive streak

Flashcard 30: By the end of the third week, neural _____ grow over the midline and fuse to form the neural tube

Answer: folds