Question
Echocardiography shows a left to right shunt just above the muscular interventricular septum. An abnormality of which of the following structures most likely produced this infant’s defect? A. Chlordae tendineae B. Crista terminalis C. Endocardial cushion D. Septum primum E. Sinus venosus

Question
Which of the following portions of the nervous sysem form nerves that migrate with the myotomes during development? A. Dorsal primary ramus B. Ventral primary ramus C. Dorsal root ganglion D. Sympathetic ganglion E. Grey communicating ramus F. White communicating ramus

Question
A product of which of the following genes is most important in signaling by the ZPA? A. Fibroblast growth factor 8 B. Homeobox-B8 C. Sonic hedgehog D. Transforming growth factor-beta E. Transforming growth - alpho

Question
By the end of the fifth week, dorsomedial somatic cells give rise to myotomes forming the epimere. Which of the following muscles is most likely derived from these cells? A. Erector spinae B. Lateral pterygoid C. Latissimus dorsi D. Psoas major E. Sternocleidomastoid

Question
A pelvic ultrasound reveals a bicornuate uterus. Which of the following is the most likely explanation for her anomalous uterus? A. Excess circulating maternal androgens while in utereo B. Failure of primordial germ cell migration C. Failure of the paramesonerphric ducts to fuse D. ...

Question
The placenta shows focal echogenic areas. Chromosome analysis shows a 69, XXY karyotype. What is the best description for the anomaly seen in the hands of this fetus? A. Brachydactyly B. Camptotactyly C. Clinodactyly D. Polydactyly E. Syndactyly

Question
The placenta shows focal echogenic areas. Chromosome analysis shows a 69, XXY karyotype. What is the best description for the anomaly seen in the hands of this fetus? A. Brachydactyly B. Camptotactyly C. Clinodactyly D. Polydactyly E. Syndactyly