Embryology and Development Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Embryology and Development. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Embryology and Development Indian Medical PG Question 1: Match the following
1. Hirschsprung's disease
2. Posterior urethral valve
3. Choledochal cyst
4. Intussusception
A. Jaundice
B. Currant jelly stools
C. Distended abdomen
D. Oligohydramnios
- A. 1-C, 2-D, 3-B, 4-A
- B. 1-A, 2-D, 3-B, 4-C
- C. 1-C, 2-D, 3-A, 4-B (Correct Answer)
- D. 1-D, 2-C, 3-A, 4-B
Embryology and Development Explanation: ***Correct Answer: 1-C, 2-D, 3-A, 4-B***
**Correct Associations:**
- **Hirschsprung's disease (1) → Distended abdomen (C)**: Congenital absence of ganglion cells in the distal bowel leads to functional obstruction and subsequent abdominal distension. This is a hallmark presentation in neonates and infants.
- **Posterior urethral valve (2) → Oligohydramnios (D)**: Urethral obstruction in utero prevents normal fetal urine output, resulting in decreased amniotic fluid (oligohydramnios). This can be detected on prenatal ultrasound.
- **Choledochal cyst (3) → Jaundice (A)**: Congenital dilatation of the bile ducts causes biliary obstruction, presenting with jaundice as part of the classic triad (jaundice, abdominal mass, and pain).
- **Intussusception (4) → Currant jelly stools (B)**: Telescoping of bowel causes mucosal ischemia and venous congestion, leading to bloody mucoid stools with characteristic "currant jelly" appearance. This is a pathognomonic feature.
*Incorrect: 1-C, 2-D, 3-B, 4-A*
- Incorrectly associates choledochal cyst with currant jelly stools (which is specific to intussusception) and intussusception with jaundice (which indicates biliary pathology).
*Incorrect: 1-A, 2-D, 3-B, 4-C*
- Wrongly links Hirschsprung's disease with jaundice instead of its characteristic abdominal distension, and misidentifies intussusception's primary feature.
*Incorrect: 1-D, 2-C, 3-A, 4-B*
- Swaps the associations between Hirschsprung's disease and PUV. Oligohydramnios is specific to urinary tract obstruction (PUV), not intestinal pathology (Hirschsprung's).
Embryology and Development Indian Medical PG Question 2: All are true except:
- A. The embryonic nucleus is situated between the two Y sutures
- B. Congenital blue dot cataracts are associated with development of senile cataract at an early stage
- C. The infantile nucleus is completely formed by one year of age (Correct Answer)
- D. Zonular cataracts typically affect the outer part of the fetal or the inner part of the adult nucleus
Embryology and Development Explanation: ***The infantile nucleus is completely formed by one year of age***
- The **infantile nucleus** is NOT completely formed by one year of age; it continues to develop from birth until approximately **3 years of age**, not just one year.
- Lens growth is a continuous process throughout life, with new fibers being laid down, leading to the formation of different nuclear layers over time.
*The embryonic nucleus is situated between the two Y sutures*
- The **embryonic nucleus** is indeed located between the **anterior and posterior Y sutures**, which mark the boundaries of the primary lens fibers.
- These sutures are formed during the early stages of lens development.
- This statement is **TRUE**.
*Congenital blue dot cataracts are associated with development of senile cataract at an early stage*
- **Blue dot cataracts (cerulean cataracts)** are typically stationary, benign, and **do not predispose** to the development of senile cataracts at an earlier stage.
- They are usually congenital and do not significantly impair vision.
- This statement is **TRUE** (they do NOT cause early senile cataracts, but the statement itself describes the condition accurately as a recognized entity).
*Zonular cataracts typically affect the outer part of the fetal or the inner part of the adult nucleus*
- **Zonular (lamellar) cataracts** are characterized by opacities that form concentric layers (zones) within the lens, typically affecting the **fetal nucleus** or the inner part of the **adult nucleus**.
- They develop around the time of birth or in early childhood, often due to metabolic disturbances.
- This statement is **TRUE**.
Embryology and Development Indian Medical PG Question 3: Neural tube defects have which one of the following inheritance patterns ?
- A. Multi-factorial (Correct Answer)
- B. X-linked recessive
- C. Autosomal dominant
- D. Autosomal recessive
Embryology and Development Explanation: ***Multi-factorial***
- Neural tube defects (NTDs) are considered **multi-factorial**, meaning they result from a complex interaction between multiple genetic predispositions and environmental factors.
- While there are genetic components, no single gene mutation typically explains the recurrence risk, and external factors like **folic acid deficiency** play a significant role.
*X-linked recessive*
- This inheritance pattern typically affects males more severely and exclusively, with females often being carriers, which is not the primary pattern observed in NTDs.
- Conditions like **Duchenne muscular dystrophy** exhibit X-linked recessive inheritance.
*Autosomal dominant*
- A single copy of an altered gene on a non-sex chromosome is sufficient to cause the condition, resulting in a 50% chance of transmission to offspring, which does not match the observed inheritance pattern for NTDs.
- Examples include **Huntington's disease** and **Marfan syndrome**.
*Autosomal recessive*
- Both copies of a gene on a non-sex chromosome must be altered for the condition to manifest, meaning parents are often carriers but unaffected, which isn't the primary inheritance pattern for NTDs.
- Conditions like **cystic fibrosis** and **sickle cell anemia** follow autosomal recessive inheritance.
Embryology and Development Indian Medical PG Question 4: Which of the following statements are correct with respect to antenatal USG examination?
1. It helps in detecting gross fetal anomalies
2. It helps in identifying multiple pregnancies
3. It helps in identifying viable pregnancy
4. Best dating is possible with third trimester ultrasound scan
- A. 3 and 4 only
- B. 1, 2 and 3 only (Correct Answer)
- C. 1 and 2 only
- D. 1, 2, 3 and 4
Embryology and Development Explanation: ***Correct: 1, 2 and 3 only***
- Antenatal ultrasound is crucial for detecting **gross fetal anomalies** (e.g., anencephaly, spina bifida, cardiac defects), identifying the presence of **multiple pregnancies** (twins, triplets), and confirming the **viability of the pregnancy** by observing fetal cardiac activity.
- Statement 4 is **incorrect** because the best dating is achieved with **first trimester ultrasound** (crown-rump length between 8-13 weeks), not third trimester, as there is less biological variation in fetal size early in gestation.
- Third trimester biometry becomes less reliable for dating due to individual growth variations.
*Incorrect: 3 and 4 only*
- While antenatal ultrasound does help in identifying viable pregnancies (statement 3), **statement 4 is false** - best dating is NOT possible with third-trimester ultrasound scan.
- This option also incorrectly omits statements 1 and 2, which are important and correct functions of antenatal ultrasound.
- The earliest ultrasound scan in the first trimester provides the most accurate dating (±5-7 days accuracy).
*Incorrect: 1 and 2 only*
- Antenatal ultrasound indeed helps in detecting **gross fetal anomalies** and **identifying multiple pregnancies** (statements 1 and 2 are correct).
- However, this option is **incomplete** as it misses the equally important role of ultrasound in **identifying viable pregnancy** (statement 3).
- Assessing viability by checking for fetal heartbeat is one of the primary reasons for early pregnancy ultrasound.
*Incorrect: 1, 2, 3 and 4*
- Statements 1, 2, and 3 are correct, as antenatal ultrasound is vital for detecting **gross fetal anomalies**, identifying **multiple pregnancies**, and confirming **viable pregnancy**.
- However, **statement 4 is incorrect** because the third trimester is not the best time for dating a pregnancy, as fetal biometry becomes less reliable due to individual growth variations.
- The most accurate dating is typically achieved in the **first trimester** (CRL measurement at 8-13 weeks gives ±5-7 days accuracy), not the third trimester.
Embryology and Development Indian Medical PG Question 5: The mechanism of hearing and memory, include all, EXCEPT:
- A. Spatial Reorganization of synapse
- B. Changes in level of neurotransmitter at synapse
- C. Increasing protein synthesis
- D. Recruitment by multiplication of neurons (Correct Answer)
Embryology and Development Explanation: ***Recruitment by multiplication of neurons***
- The **brain's capacity for learning and memory** primarily involves changes in existing neural circuits, not the multiplication of neurons in the adult brain for new information processing.
- While neurogenesis occurs in specific brain regions (e.g., hippocampus), it is not a widespread mechanism for acquiring or storing specific memories or the rapid processing involved in hearing.
*Spatial Reorganization of synapse*
- This refers to the **restructuring of synaptic connections**, which is a crucial mechanism for long-term potentiation and depression, fundamental to learning and memory formation.
- Changes in the **number or location of synapses** can alter neural pathways and strengthen or weaken signal transmission.
*Changes in level of neurotransmitter at synapse*
- Alterations in the **amount of neurotransmitter released** or the **sensitivity of postsynaptic receptors** significantly impact synaptic strength and neuronal communication.
- This short-term and long-term modulation is vital for processes like habituation, sensitization, and long-term potentiation, integral to memory and sensory processing.
*Increasing protein synthesis*
- **New protein synthesis** is essential for the consolidation of long-term memories and for the structural changes underlying synaptic plasticity.
- These proteins can range from enzymes that modify synaptic transmission to structural proteins that alter dendritic spine morphology, enabling lasting changes in neural circuits.
More Embryology and Development Indian Medical PG questions available in the OnCourse app. Practice MCQs, flashcards, and get detailed explanations.
