A 37-year-old man has been diagnosed with pheochromocytoma, a tumor of the adrenal medulla cells that secretes large amounts of catecholamines. Which of the following gives rise to the cells responsible for this condition?

A 32-year-old pregnant woman presents to the obstetrics clinic for a routine prenatal check-up at 20 weeks gestation. During the ultrasound examination, the obstetrician notes the presence of a well-defined amniotic cavity surrounding the fetus. The amniotic fluid appears to be within normal limits. 

Which of the following embryonic layers is responsible for the formation of the lining membrane of the amniotic cavity?

A 28-year-old woman presents to her obstetrician's office for her first prenatal visit at 8 weeks gestation. During the visit, the physician discusses the early development of the embryo. 

Which of the layers primarily contribute to nourishing the embryo during its early stages of development?

A 3-month-old male infant is brought to the pediatrician by his parents due to feeding difficulties and characteristic facial features. Upon examination, the infant displays downward-slanting palpebral fissures, colobomas of the lower eyelids, malar hypoplasia, and a prominent nose with a flat nasal bridge. Additionally, the infant has a small mandible (micrognathia) with a high-arched palate. These features are consistent with Treacher Collins syndrome (TCS). 

Which of the following embryological processes is most directly implicated in the pathogenesis of this syndrome?

A 37-year-old man has been diagnosed with pheochromocytoma, a tumor of the adrenal medulla cells that secretes large amounts of catecholamines. Which of the following gives rise to the cells responsible for this condition?

A 50-year-old man slipped and fell down the stairs and has injured his back. He now has sharp pain that runs down the posterior aspect of his right leg. Imaging shows herniation of the nucleus pulposus of his L4 spinal disc. 

The herniated structure is derived from the…………….. 

A 55-year-old man has noted sharp pain in his right lower extremity for the past 2 months. MR imaging of his spine shows impingement on a spinal nerve root by a herniated central part of a structure located between L5 and S1. 

From which of the following embryonic derivatives does this herniated structure most likely arise?

Altered development of which of the following is most likely to account for the observations AS IN THE ATTACHED IMAGE?

A 19-year-old woman comes to the physician because of a 5-day history of increasingly severe right lower abdominal pain and bloody vaginal discharge. Her last menstrual period was 8 weeks ago. Abdominal examination shows exquisite tenderness of the right lower quadrant. A serum pregnancy test result is positive. Ultrasonography shows no gestational sac in the uterus. Which of the following is the most likely location of this patient’s fertilized egg?

A 32-year-old woman presents to her obstetrician for her first prenatal visit. During the consultation, the physician discusses the early development of the embryo. 

Which of the following statements accurately describes the composition of the epiblast during embryonic development?