Systemic Anatomy — MCQs
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The right suprarenal vein drains into which vessel?
All the following openings in the right atrium are guarded by a valve except
What is the normal weight range upper limit of a human liver?
Portal vein is formed by the union of which structures?
Left ovarian vein drains into which structure?
About the ureter, which of the following is true?
Which of the following does not form a visceral relation with the spleen?
Careful examination of the central depressed area of the nipple demonstrates multiple small openings, which are from which of the following?
Which of the following is an anterior branch of the internal iliac artery?
What is the approximate total length of the colon in adults?
Systemic Anatomy Indian Medical PG Practice Questions and MCQs
Question 381: The right suprarenal vein drains into which vessel?
- A. Inferior vena cava (Correct Answer)
- B. Right renal vein
- C. Right Gonadal vein
- D. Left Renal vein
Explanation: ***Inferior vena cava*** - The **right suprarenal vein** drains directly into the **inferior vena cava (IVC)** [1], [2]. - This is a key anatomical distinction from the left suprarenal vein [1]. *Right renal vein* - The right renal vein primarily drains the **right kidney** and typically does not receive the suprarenal vein. - It empties into the **inferior vena cava**. *Right Gonadal vein* - The right gonadal (testicular or ovarian) vein generally drains directly into the **inferior vena cava**, distinct from the suprarenal venous drainage. - Its drainage pattern is similar to the right suprarenal vein in that both directly enter the IVC, but they are separate vessels. *Left Renal vein* - The **left suprarenal vein** drains into the **left renal vein** before it empties into the inferior vena cava [1]. - This is a common anatomical variant that distinguishes it from the direct drainage of the right suprarenal vein [1].
Question 382: All the following openings in the right atrium are guarded by a valve except
- A. Superior vena cava (Correct Answer)
- B. Inferior vena cava
- C. Coronary sinus
- D. Atrioventricular opening
Explanation: ***Superior vena cava*** - The opening of the **superior vena cava** into the right atrium is generally not guarded by a valve. - Its blood flow into the heart is maintained by relatively low pressure and directly continuous with the right atrium. *Inferior vena cava* - The opening of the **inferior vena cava** into the right atrium is guarded by a rudimentary valve called the **Eustachian valve** [1]. - This valve is more prominent in fetal life, helping to direct oxygenated blood from the umbilical vein to the foramen ovale [1]. *Coronary sinus* - The opening of the **coronary sinus** into the right atrium is guarded by the **Thebesian valve**. - This valve's function is to prevent regurgitation of blood from the right atrium into the coronary sinus during atrial systole. *Atrioventricular opening* - The **right atrioventricular opening** is guarded by the **tricuspid valve** [2]. - This valve prevents backflow of blood from the right ventricle into the right atrium during ventricular systole [2].
Question 383: What is the normal weight range upper limit of a human liver?
- A. 1.5 kg (Correct Answer)
- B. 4 kg
- C. 0.5 kg
- D. 7 kg
Explanation: ***1.5 kg*** - The **normal adult human liver** typically weighs between **1.2 to 1.5 kg**, with 1.5 kg representing the **upper limit** of the normal range. - Liver weight varies slightly based on **body mass** and **sex** (males typically have slightly heavier livers than females, averaging 1.4-1.5 kg vs 1.2-1.4 kg). - This weight represents approximately **2% of total body weight** in adults. *4 kg* - A liver weighing 4 kg would be considered significantly **enlarged (hepatomegaly)**, indicating an underlying pathological condition. - Conditions such as **severe fatty liver disease**, **massive hepatic tumors**, or advanced **cirrhosis with portal hypertension** could lead to such dramatic increases in liver size and weight. *0.5 kg* - A liver weighing 0.5 kg would be indicative of a severely **atrophied liver**, well below the normal healthy range. - This could be seen in end-stage **cirrhosis** or **acute liver failure** where there is significant loss of functioning hepatic tissue. *7 kg* - A liver weighing 7 kg would represent an **extremely rare** and massive enlargement, far beyond typical pathological conditions. - This weight would suggest **extreme hepatomegaly** due to conditions like massive polycystic liver disease, extensive tumor infiltration, or severe metabolic storage disorders.
Question 384: Portal vein is formed by the union of which structures?
- A. Superior Mesenteric and Splenic Veins (Correct Answer)
- B. Superior Mesenteric and Left Renal Vein
- C. Inferior Mesenteric and Splenic Vein
- D. Superior Mesenteric and Inferior Mesenteric Veins
Explanation: ***Superior Mesenteric and Splenic Veins*** - The **hepatic portal vein** is primarily formed posterior to the neck of the pancreas by the confluence of the **superior mesenteric vein (SMV)** and the **splenic vein** [1]. - The **SMV** drains blood from the small intestine, cecum, ascending colon, and part of the transverse colon, while the **splenic vein** drains blood from the spleen, stomach, and pancreas [2]. *Superior Mesenteric and Left Renal Vein* - The **left renal vein** drains blood from the left kidney and typically empties into the **inferior vena cava (IVC)**, not participating in portal vein formation. - The **SMV** is a component, but its union with the left renal vein does not form the portal vein. *Inferior Mesenteric and Splenic Vein* - The **inferior mesenteric vein (IMV)** typically drains into the **splenic vein** (which then joins the SMV) or, less commonly, directly into the SMV or the junction of the SMV and splenic vein, but it does not directly form the main portal vein with the splenic vein. - The **splenic vein** is a major component, but the IMV's contribution is usually indirect via the splenic vein. *Superior Mesenteric and Inferior Mesenteric Veins* - While both of these are major veins of the portal system, they do not directly unite to form the main **portal vein**. - The **IMV** usually drains into the **splenic vein** before it joins the **SMV** to form the portal vein.
Question 385: Left ovarian vein drains into which structure?
- A. Left renal vein (Correct Answer)
- B. Internal iliac vein
- C. Inferior vena cava
- D. Azygos vein
Explanation: ***Left renal vein*** - The **left ovarian vein** drains into the **left renal vein** [1], which then empties into the inferior vena cava. - This anatomical arrangement can contribute to the higher incidence of **left-sided varicocele** in males due to the increased hydrostatic pressure and perpendicular drainage angle. *Internal iliac vein* - The **internal iliac vein** primarily drains structures within the **pelvis**, such as the bladder, rectum, and reproductive organs. - While it is a major venous channel in the pelvis, it does not directly receive flow from the ovarian veins. *Inferior vena cava* - The **inferior vena cava (IVC)** is the large vein that carries deoxygenated blood from the lower and middle body to the right atrium of the heart. - The **right ovarian vein** drains directly into the IVC [1], but the left ovarian vein drains into the left renal vein first. *Azygos vein* - The **azygos vein** system collects deoxygenated blood from the **posterior walls of the thorax and abdomen**, emptying into the superior vena cava. - It is part of the systemic venous circulation but is not involved in the drainage of the ovarian veins.
Question 386: About the ureter, which of the following is true?
- A. 5 cm long
- B. 25 cm long (Correct Answer)
- C. 35 cm long
- D. Primarily retroperitoneal, but may have intraperitoneal segments
Explanation: ***25 cm long*** - The ureters are typically about **25 to 30 cm long** in adults, extending from the kidneys to the bladder. - This length allows for the efficient transport of urine through peristaltic contractions. *5 cm long* - A length of 5 cm is significantly too short for the ureter, which connects the kidney to the bladder. - No major urinary tract structure in adults is typically this short. *35 cm long* - While there can be slight variations, 35 cm is on the longer end and not the average length of the ureter. - The typical range is closer to 25-30 cm. *Primarily retroperitoneal, but may have intraperitoneal segments* - The ureters are **entirely retroperitoneal** structures, meaning they lie behind the peritoneum throughout their course. - They do not have intraperitoneal segments; organs that are intraperitoneal are completely surrounded by peritoneum.
Question 387: Which of the following does not form a visceral relation with the spleen?
- A. Stomach
- B. Splenic flexure of colon
- C. Left kidney
- D. Adrenal glands (Correct Answer)
Explanation: The adrenal glands, specifically the **left adrenal gland**, are located superior to the **left kidney** but are generally not in direct visceral relation with the spleen itself [2]. The spleen's concavities accommodate other organs. The spleen is typically located in the **left hypochondrium**, nestled against the diaphragm, superior to the left kidney, but the adrenal gland is usually separated by the kidney or surrounding fascia. *Stomach* - The **gastric impression** on the spleen's anterior surface is formed by the fundus of the **stomach**, indicating a direct visceral relation [3]. - The stomach is one of the primary organs that directly abuts the spleen's visceral surface. *Splenic flexure of colon* - The **colic impression** on the inferior aspect of the spleen is formed by the **splenic flexure of the colon**, confirming a direct visceral relation [1]. - This anatomical arrangement explains why an enlarged spleen can sometimes be palpated near the colon. *Left kidney* - The **renal impression** on the posterior aspect of the spleen is formed by the anterior superior surface of the **left kidney**, establishing a clear visceral relation [1]. - The spleen lies directly superior and lateral to the left kidney.
Question 388: Careful examination of the central depressed area of the nipple demonstrates multiple small openings, which are from which of the following?
- A. Lactiferous ducts (Correct Answer)
- B. Sweat glands
- C. Areolar tissue
- D. Montgomery glands
Explanation: ***Lactiferous ducts*** - The **nipple** has approximately 15-20 small openings, which are the terminations of the **lactiferous ducts** [1]. - These ducts are responsible for transporting **milk** from the mammary glands to the outside during lactation [1]. *Areolar tissue* - The **areolar tissue** is the pigmented skin surrounding the nipple, not the nipple itself, and does not contain the openings for milk release. - It contains **sebaceous glands** and smooth muscle fibers, but no direct ducts for milk [1]. *Montgomery glands* - **Montgomery glands** are sebaceous glands located in the **areola**, not the nipple, and become more prominent during pregnancy and lactation [1]. - They secrete an **oily substance** that lubricates and protects the nipple and areola. *Sweat glands* - While present in the skin, **sweat glands** are generally distributed throughout the body and are not concentrated as distinct openings in the central depressed area of the nipple. - Their primary function is **thermoregulation**, not milk secretion.
Question 389: Which of the following is an anterior branch of the internal iliac artery?
- A. Superior gluteal artery
- B. Ilio-lumbar artery
- C. Superior vesical artery (Correct Answer)
- D. Inferior gluteal artery
Explanation: ***Superior vesical artery*** - The **superior vesical artery** is typically a **patent remnant of the umbilical artery** and supplies the superior part of the urinary bladder and distal ureter. - It is consistently described as an anterior branch of the internal iliac artery, along with the **umbilical, obturator, inferior vesical, middle rectal, uterine, vaginal, and internal pudendal arteries**. *Superior gluteal artery* - The **superior gluteal artery** is the largest branch of the internal iliac artery, but it consistently arises from the **posterior division**. - It exits the pelvis through the **greater sciatic foramen** superior to the piriformis muscle to supply the gluteal muscles. *Ilio-lumbar artery* - The **ilio-lumbar artery** is a branch of the **posterior division** of the internal iliac artery. - It ascends to supply the **psoas major** and **quadratus lumborum muscles**, and anastomoses with the lumbar and deep circumflex iliac arteries. *Inferior gluteal artery* - The **inferior gluteal artery** is a main artery of the gluteal region, but it typically arises from the **posterior division** of the internal iliac artery, or occasionally from a common trunk with the superior gluteal artery, which also originates posteriorly. - It exits the pelvis through the **greater sciatic foramen**, inferior to the piriformis muscle, to supply the gluteus maximus and adjacent structures.
Question 390: What is the approximate total length of the colon in adults?
- A. 1 metre
- B. 1.5 metres (Correct Answer)
- C. 2 metres
- D. 4 metres
Explanation: ***1.5 metres*** - The **colon**, or large intestine, generally measures about **1.5 meters (5 feet)** in length in healthy adults. - This length allows for efficient **water absorption** and formation of feces [1]. *1 metre* - This length is shorter than the typical adult colon, which is usually longer to facilitate its digestive functions. - A length of 1 meter might be closer to the small intestine or an unusually short colon. *2 metres* - This length is slightly longer than the average adult colon. - While there can be individual variations, 2 meters is generally considered to be on the longer side for the large intestine. *4 metres* - This length is significantly longer than the typical adult colon. - The **small intestine** is much longer, often around 6 meters, but the colon is considerably shorter.
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