UPSC-CMS 2023 - Anatomy PYQs Practice Questions

Q: The inability to flex the index finger is a sign of

Median nerve injury. ***Median nerve injury*** - The **median nerve** innervates the **flexor digitorum superficialis** and the **flexor digitorum profundus** (radial half), which are responsible for flexing the index and middle fingers. [1] - Damage to this nerve at a high level (e.g., above the elbow) would impact these muscles, leading to an **inability to flex the index finger**. [1] *Radial nerve injury* - The **radial nerve** primarily innervates the **extensor muscles** of the arm and forearm. - Injury to this nerve would result in difficulty extending the wrist and fingers (e.g., **wrist drop**), not flexing them. *Ulnar nerve injury* - The **ulnar nerve** innervates the **flexor carpi ulnaris** and the **ulnar half of the flexor digitorum profundus** (ring and pinky finger). [1] - Damage would primarily affect the flexion of the ring and little fingers, as well as intrinsic hand muscles, leading to a **claw hand deformity**. *Dupuytren's contracture* - This condition involves **fibrosis and thickening of the palmar fascia**, causing the fingers (most commonly the ring and little fingers) to permanently flex towards the palm. - It is a **fibroproliferative disorder** of the hand, not a nerve injury, and typically affects flexibility in multiple fingers in a characteristic pattern, rather than a specific inability to flex one finger due to paralysis. [Practice more Anatomy PYQs on OnCourse]

Q: Inhaled foreign bodies are more likely to get lodged in the right main bronchus because

Right main bronchus is shorter, wider and nearly vertical. ***Right main bronchus is shorter, wider and nearly vertical*** - The **anatomical configuration** of the right main bronchus makes it a more direct continuation of the trachea. - Its **wider diameter** and **more vertical angle** allow foreign bodies to fall into it more easily due to gravity and airflow. *Left main bronchus is wider and shorter* - This statement is incorrect; the **left main bronchus** is actually **narrower and longer** than the right. - Its **more acute angle** stemming from the trachea also makes it less likely for foreign objects to lodge there directly. *Right main bronchus is shorter, narrower and lies horizontally in relation to trachea* - This statement is incorrect as the **right main bronchus** is indeed **shorter** but is **wider** and takes a **more vertical** course, not horizontal. - The description of being "narrower" and "horizontally" contradicts the anatomical characteristics that facilitate foreign body impaction. *Left main bronchus is narrow and longer* - This statement is anatomically correct for the left main bronchus; however, these characteristics make it **less likely** for foreign bodies to get lodged here. - The **narrower lumen** and **longer path**, combined with a more acute angle, make it a less direct route for inhaled objects. [Practice more Anatomy PYQs on OnCourse]

Q: The following are the branches of the anterior division of internal iliac artery except

Superior rectal artery. ***Superior rectal artery*** - This artery is a direct continuation of the **inferior mesenteric artery**, which is a branch of the **abdominal aorta**, not the internal iliac artery. - It supplies the **superior part of the rectum** and is not associated with the internal iliac artery's divisions. *Inferior vesical artery* - This artery typically arises from the **anterior division of the internal iliac artery** and supplies the **bladder** and male reproductive organs. - It is a correct branch of the anterior division, making it an incorrect answer to the "except" question. *Uterine artery* - The **uterine artery** is a significant branch of the **anterior division of the internal iliac artery** in females. - It supplies the **uterus**, vagina, and surrounding structures, confirming its origin from the anterior division. *Middle rectal artery* - This artery originates from the **anterior division of the internal iliac artery** and supplies the **middle portion of the rectum**. [1] - It is a recognized branch of the anterior division, so it is not the exception. [Practice more Anatomy PYQs on OnCourse]

Q: The inferior rectal artery is a branch of :

Internal pudendal artery. ***Internal pudendal artery*** - The **inferior rectal artery** is a key branch of the **internal pudendal artery**, supplying blood to the anal canal below the pectinate line. - This artery typically arises in the **ischioanal fossa** (also known as the ischiorectal fossa), providing vascularization to the external anal sphincter and perineal skin. *Inferior mesenteric artery* - The **inferior mesenteric artery** is responsible for supplying large intestine structures from the distal transverse colon to the superior part of the rectum [1]. - Its main branches are the **left colic artery**, **sigmoid arteries**, and **superior rectal artery**, none of which directly give rise to the inferior rectal artery [1]. *Internal iliac artery* - The **internal iliac artery** is a large artery that supplies many pelvic organs and the perineum; it gives off the **internal pudendal artery** as one of its terminal branches. - While it is the source of the internal pudendal artery, it does not directly branch into the inferior rectal artery. *Median sacral artery* - The **median sacral artery** is a small, unpaired artery that arises from the posterior aspect of the abdominal aorta just above its bifurcation. - It supplies structures in the posterior pelvic wall, such as the sacrum, coccyx, and adjacent posterior muscles but has no direct connection to the inferior rectal artery. [Practice more Anatomy PYQs on OnCourse]

Q: Which of the following statements with regard to Meckel's Diverticulum are correct? 1. It represents a persistent remnant of the vitellointestinal duct. 2. It is a true diverticulum of gastrointestinal tract. 3. It is most commonly found on anti-mesenteric border of ileum. 4. Heterotopic mucosa is present in 50-60% of patients. Select the correct answer using the code given below:

1, 2 and 3. ***Option: 1, 2 and 3 (Correct Answer)*** - **Statement 1 is correct:** Meckel's diverticulum is a **congenital anomaly** resulting from incomplete obliteration of the **vitellointestinal (vitelline) duct**, which connects the midgut to the yolk sac during embryonic development [1]. - **Statement 2 is correct:** It is a **true diverticulum** because it contains all three layers of the intestinal wall: mucosa, submucosa, and muscularis propria (unlike false diverticula which only contain mucosa and submucosa). - **Statement 3 is correct:** It arises from the **anti-mesenteric border of the ileum**, typically within 60-100 cm proximal to the ileocecal valve [1]. - **Statement 4 is incorrect:** Heterotopic mucosa (most commonly gastric mucosa, followed by pancreatic tissue) is present in approximately **20-30% of all Meckel's diverticula**. The 50-60% figure applies specifically to **symptomatic cases**, not all patients with the condition [1]. *Option: 1, 3 and 4* - While statements 1 and 3 are correct, statement 4 overstates the prevalence of heterotopic mucosa in the general population with Meckel's diverticulum [1]. - Additionally, this option excludes statement 2, which is definitively correct and represents an essential characteristic of Meckel's as a true diverticulum. *Option: 1, 2 and 4* - Statements 1 and 2 are correct, but statement 4's percentage for heterotopic mucosa (50-60%) is too high for the overall population [1]. - The actual prevalence of heterotopic mucosa is **20-30% in all cases**, though it is found in the majority of symptomatic presentations. *Option: 1 and 3* - While statements 1 and 3 are correct, this option incorrectly excludes statement 2. - Statement 2 is unequivocally correct: Meckel's is a **true diverticulum** with all intestinal wall layers, which distinguishes it from false diverticula. [Practice more Anatomy PYQs on OnCourse]

Question 1

The inability to flex the index finger is a sign of

Accepted Answer

Median nerve injury

Answer

Radial nerve injury

Answer

Ulnar nerve injury

Answer

Dupuytren's contracture

Question 2

Inhaled foreign bodies are more likely to get lodged in the right main bronchus because

Accepted Answer

Right main bronchus is shorter, wider and nearly vertical

Answer

Left main bronchus is wider and shorter

Answer

Right main bronchus is shorter, narrower and lies horizontally in relation to trachea

Answer

Left main bronchus is narrow and longer

Question 3

The following are the branches of the anterior division of internal iliac artery except

Accepted Answer

Superior rectal artery

Answer

Inferior vesical artery

Answer

Uterine artery

Answer

Middle rectal artery

Question 4

The inferior rectal artery is a branch of :

Accepted Answer

Internal pudendal artery

Answer

Inferior mesenteric artery

Answer

Internal iliac artery

Answer

Median sacral artery

Question 5

Which of the following statements with regard to Meckel's Diverticulum are correct?

1. It represents a persistent remnant of the vitellointestinal duct.
2. It is a true diverticulum of gastrointestinal tract.
3. It is most commonly found on anti-mesenteric border of ileum.
4. Heterotopic mucosa is present in 50-60% of patients.

Select the correct answer using the code given below:

Accepted Answer

1, 2 and 3

Answer

1, 3 and 4

Answer

1, 2 and 4

Answer

1 and 3

Question 6

Which of the following set of muscles collectively form the muscle 'Levator Ani' that forms the pelvic floor ?

1. Puborectalis
2. Pubococcygeus
3. Sacrococcygeus
4. Iliococcygeus

Select the correct answer using the code given below :

Accepted Answer

1, 2 and 4

Answer

2, 3 and 4

Answer

1, 3 and 4

Answer

1, 2 and 3

Question 7

Blood supply to the uterus comes from which of the following arteries ?

1. Ovarian artery
2. Vaginal artery
3. Uterine artery
4. Inferior vesical artery

Select the correct answer using the code given below :

Accepted Answer

1, 2 and 3

Answer

2, 3 and 4

Answer

1, 3 and 4

Answer

1, 2 and 4

UPSC-CMS 2023 — Anatomy