1/10
A 5-year-old boy is brought to the office by his parents for evaluation of hypnosis with minimal exertion. The boy has had occasional episodes of 'turning blue' that first began during infancy and are now occurring more frequently. During the episodes, the boy assumes a squatting position as it makes him 'feel better.' The family recently immigrated to the United States; the boy has never had a medical checkup prior to this visit Physical examination reveals a prominent right ventricular impulse and a harsh systolic murmur. Which of the following embryological events is the Sterno likely mechanism that caused this patient's condition?
- Abnormal primitive heart tube looping
- Anomalous pulmonary venous return
- Aortic arch constriction
- Deviation of the inter ventricular septum
- Cardinal cushion defect
2/10
A 64-year-old Caucasian male loses consciousness near the entrance to an emergency room. A physician rushes to the patient and palpates a strong pulse along the inner side of the sadomasochistic muscle. The vessel palpated by the doctor is a derivative of which of the following aortic arches?
- First
- Second
- Third
- Fourth
- Sixth
3/10
If there is improper fusion of the maxillary prominence with the medial nasal prominence during embryonic development, the likely consequence will be:
- Cleft palate
- Cleft lip
- Di George syndrome
- Bacchanal Tiresias
- Pharyngeal fistula
4/10
A 33-year-old male presents to the ER complaining of headaches, nausea, tremulousness, and sweating that has happened periodically over the last several months. Family history is positive for hyperparathyroidism. His blood pressure is 200/120 mmHg while standing and 190/110 mmHg while supine. Thorough evaluation of this patient reveals increased urinary vanillylmandelic acid (VMA) excretion as well as a right-sided adrenal mass on CT scan. The cells responsible for this patient's disease most likely have a common embryological origin with which of the following thyroid cells?
- Follicular cells
- Parafollicular cells
- Capillary endothelium
- Interstitial fibroblasts
- Capillary pericytes
5/10
A young female is being evaluated for infertility.A hysterogram (image below) is obtained as part of a comprehensive evaluation.
Which of the following embryologic processes failed in this patient?

Which of the following embryologic processes failed in this patient?

- Fusion of the paramesonephric ducts
- Fusion of the mesonephric ducts
- Differentiation of the mesonephric tubules
- Involution of the paramesonephric ducts
- Fusion of the urethral folds
6/10
A 2-day-old neonate is brought to the emergency department by her mother because of persistent vomiting and refusal to feed. The vomiting began early in the morning and has been greenish-yellow in color.
Laparotomy performed after initial work-up reveals the absence of a large segment of small bowel, with the distal ileum seen winding around a thin vascular stalk. Which of the following intrauterine processes is most likely responsible for this patient's condition?
Laparotomy performed after initial work-up reveals the absence of a large segment of small bowel, with the distal ileum seen winding around a thin vascular stalk. Which of the following intrauterine processes is most likely responsible for this patient's condition?
- Vascular occlusion
- Cell migration failure
- Recanalization failure
- Abnormal fusion and rotation
- Incomplete descent
7/10
A 3-year-old boy is brought to the emergency department by his parents after he develops acute abdominal pain and vomiting. Imaging studies reveal a foreign body lodged within his intestine causing small bowel obstruction. Laparotomy is performed to remove the foreign body;during the procedure,an incidental abdominal cyst is discovered and removed. The cyst is connected by a fibrous band to the ileum and the umbilicus. Which of the following conditions is also caused by the same embryologic defect responsible for this patient's abdominal cyst?
- Duodenal atresia
- Hirschsprung disease
- Meckel diverticulum
- Umbilical hernia
- Imperforate anus
- Omphalocele
- Malrotation
8/10
A young couple presents to your office for an infertility evaluation. They have been trying to conceive for one year. Initial evaluation of the female partner suggests normal ovulation would be in which of the following stages of gametogensis?
- Prophase of meiosis I
- Metaphase of meiosis I
- Telophase of meiosis I
- Prophase of meiosis II
- Metaphase of meiosis II
- Telophase of meiosis II
- Prophase of mitosis
9/10
An infant born to a 22-year-old female has ambiguous genitalia. The gonadal cells contain a Y chromosome and there is no uterus on pelvic examination. The absence of a uterus is due to the effects of which of the following substances in the fetal period?
- Testosterone (T)
- Dihydrotestosterone (DHT)
- Dehydroepiandrosterone (DHEA)
- Luteinizing hormone (LH)
- Mullerian inhibitory factor (MIF)
10/10
A 27-year-old pregnant female presents to your office at 12-week gestation for a routine check-up. Her past medical history is significant for epilepsy that is well controlled with valproate. She takes no othermedications. Physical examination findings are within normal limits. She is concerned about whether taking valproate during her pregnancy could cause any birth defects or developmental abnormalities. Which of the following congenital abnormalities is most likely to develop in her offspring?
- Coarctalion of the aorta
- Duodenal atresia
- Meningocele
- Renal agenesis
- Ebsteins anomaly
已结束!
请选择一个选项!