Systemic Anatomy — MCQs
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What is the vertical extent of the breast along the midclavicular line?
The abdominal part of the esophagus is supplied by:
In which area of the body is a minor impact most likely to cause a bruise?
The spleen is located in which part of the peritoneal cavity?
Haustrations are characteristic features of which part of the gastrointestinal tract?
What is the approximate length of the external auditory canal in millimeters?
At which anatomical level is the deep cardiac plexus located?
Which of the following statements about the portal venous system is true?
Which of the following is the terminal group of lymph nodes for the colon?
Most common position of the appendix is?
Systemic Anatomy Indian Medical PG Practice Questions and MCQs
Question 321: What is the vertical extent of the breast along the midclavicular line?
- A. 1st to 3rd rib
- B. 2nd to 6th rib (Correct Answer)
- C. 5th to 8th rib
- D. 7th to 10th rib
Explanation: ***2nd to 6th rib*** - The **breast extends vertically** from the 2nd to the 6th rib in the midclavicular line. - This anatomical range is consistent with the typical location of **mammary tissue** in adult females. *1st to 3rd rib* - This range is too high and does not encompass the full vertical extent of the **normal breast tissue**. - The majority of the breast tissue, especially the more inferior portion, would be missed with this description. *5th to 8th rib* - This range is too low and does not include the superior extent of the **breast tissue**, which typically reaches the 2nd or 3rd rib. - While some inferior breast tissue might be in this range, it's not the complete vertical span. *7th to 10th rib* - This range is significantly too low and would describe an area primarily composed of **abdominal wall** or lower chest, rather than normal breast tissue. - It falls outside the anatomical boundaries of the **mammary gland**.
Question 322: The abdominal part of the esophagus is supplied by:
- A. Pulmonary trunk
- B. Bronchial artery and arch of aorta
- C. Right gastric artery and inferior phrenic artery
- D. Left gastric artery and inferior phrenic artery (Correct Answer)
Explanation: ***Left gastric artery and inferior phrenic artery*** - The **abdominal part of the esophagus** receives its arterial supply primarily from branches of the **left gastric artery** and the **inferior phrenic arteries**. - This arrangement ensures adequate blood flow as the esophagus transitions from the thorax to the abdomen. *Pulmonary trunk* - The **pulmonary trunk** is involved in the pulmonary circulation, carrying deoxygenated blood from the right ventricle to the lungs. - It does not supply any part of the esophagus. *Bronchial artery and arch of aorta* - **Bronchial arteries** supply the **thoracic portion of the esophagus**, not the abdominal part. - While the **arch of the aorta** gives rise to several major arteries, its direct branches do not vascularize the abdominal esophagus. *Right gastric artery and inferior phrenic artery* - The **right gastric artery** supplies the lesser curvature of the stomach and does not typically contribute to the arterial supply of the esophagus. - While the **inferior phrenic artery** does contribute, the right gastric artery does not.
Question 323: In which area of the body is a minor impact most likely to cause a bruise?
- A. Back
- B. Sole
- C. Face (Correct Answer)
- D. Palm
Explanation: ***Face*** - The **face** has abundant **capillaries** close to the surface of the skin, making it highly susceptible to visible bruising even from minor impacts. - The relatively **thin skin** and underlying bone structures enhance the visibility of extravasated blood. *Back* - The **back** has thicker skin and a larger amount of underlying muscle and fat, which can cushion impacts and make bruises less visible or less likely to form from minor trauma. - Bruises on the back often require a more significant impact due to these protective layers. *Sole* - The **sole** of the foot has extremely **thick skin** (stratum corneum) and a dense connective tissue layer designed to withstand constant pressure and friction. - This anatomical adaptation makes it very difficult for minor impacts to cause a visible bruise on the sole. *Palm* - Similar to the sole, the **palm** of the hand has very **thick skin** and a dense network of fibrous tissue and fat that protect underlying blood vessels. - Minor impacts are unlikely to cause visible bruising in this area due to these protective layers.
Question 324: The spleen is located in which part of the peritoneal cavity?
- A. Greater sac (Correct Answer)
- B. Paracolic gutter
- C. Left subhepatic space
- D. Infracolic compartment
Explanation: ***Greater sac*** - The **spleen** is an intraperitoneal organ located in the **left upper quadrant** of the abdomen, specifically residing within the greater sac of the peritoneal cavity [1]. - Its position is posterior to the stomach and anterior to the left kidney, connected by the **gastrosplenic** and **lienorenal ligaments** [1]. *Paracolic gutter* - The **paracolic gutters** are peritoneal recesses located lateral to the ascending and descending colons, allowing for fluid flow within the abdomen. - While fluid can accumulate here, the spleen itself is not located within these gutters. *Left subhepatic space* - The **left subhepatic space** is situated beneath the left lobe of the liver and anterior to the stomach. - The spleen is located more laterally and posteriorly to this space, further to the left. *Infracolic compartment* - The **infracolic compartment** is the region of the peritoneal cavity inferior to the transverse colon, divided by the small bowel mesentery. - The spleen is located in the supracolic compartment, superior to the transverse colon.
Question 325: Haustrations are characteristic features of which part of the gastrointestinal tract?
- A. Large intestine (Correct Answer)
- B. Duodenum
- C. Jejunum
- D. Gallbladder
Explanation: ***Large intestine*** - **Haustrations** are characteristic pouches of the large intestine, formed by the contraction of its outer longitudinal muscle layer, the **taeniae coli**. - These segmental sacculations give the colon its **bumpy appearance** and play a role in **mixing and propelling** fecal contents [4]. *Duodenum* - The duodenum is the first part of the small intestine and is characterized by **plicae circulares (circular folds)** and **villi**, which increase its surface area for absorption [2], [3]. - It lacks the distinct segmental pouches known as haustrations. *Jejunum* - The jejunum is the middle section of the small intestine, also rich in **plicae circulares** and **villi** for efficient nutrient absorption [2]. - Like the duodenum, it does not possess haustrations. *Gallbladder* - The gallbladder is an organ that **stores and concentrates bile**, located beneath the liver [1]. - Its internal surface is characterized by a rugose (folded) mucosa, but it does not have haustrations, which are structural features of the colon wall.
Question 326: What is the approximate length of the external auditory canal in millimeters?
- A. 36 mm
- B. 24 mm (Correct Answer)
- C. 15 mm
- D. 10 mm
Explanation: ***24 mm*** - The external auditory canal (EAC) in adults is approximately **24 to 25 mm** in length from the concha to the tympanic membrane [1]. - This length allows for a degree of protection for the **tympanic membrane** from trauma and temperature changes [1]. *15 mm* - This length is significantly shorter than the average length of the adult external auditory canal. - A canal this short might expose the **tympanic membrane** to external elements more readily. *10 mm* - This value represents only a fraction of the actual length of the external auditory canal. - Such a short canal would be highly atypical and could indicate a **developmental anomaly**. *36 mm* - While longer than the average, 36 mm is usually considered too long for the typical adult external auditory canal. - An excessively long canal might impede proper sound conduction or ear cleaning.
Question 327: At which anatomical level is the deep cardiac plexus located?
- A. At the level of Aortic arch
- B. At end of SVC
- C. Tracheal bifurcation (Correct Answer)
- D. At Right bronchus
Explanation: ***Tracheal bifurcation*** - The **deep cardiac plexus** is primarily located ventral to the **tracheal bifurcation** and dorsal to the **aortic arch**. - Its position at this level allows it to receive branches from the **vagus and sympathetic nerves** to innervate the heart. *At the level of aortic arch* - While the cardiac plexus is in close proximity to the **aortic arch**, the deep plexus is specifically located *dorsal* to it, with the **tracheal bifurcation** being a more precise landmark for its general position. - The **superficial cardiac plexus** is more directly associated with the concavity of the aortic arch. *At end of SVC* - The **superior vena cava (SVC)** terminates at the right atrium, which is superior to the primary location of the deep cardiac plexus. - The plexus is situated more medially and inferiorly relative to the end of the SVC. *At right bronchus* - The **right bronchus** originates from the trachea at the bifurcation, but stating "at right bronchus" is less specific than "tracheal bifurcation" for the location of the *entire* deep cardiac plexus. - The plexus is an expansive network that lies around the carina, where the trachea divides into main bronchi.
Question 328: Which of the following statements about the portal venous system is true?
- A. Whole system is valveless (Correct Answer)
- B. Valves are present in the intrahepatic system
- C. There are about 10-12 valves along the entire course
- D. Valves are present at the junction of superior mesenteric vein and splenic vein
Explanation: ***Whole system is valveless*** - The **portal venous system** lacks valves, which is a key distinguishing feature from systemic veins [1]. - This valveless nature allows for **bidirectional blood flow** under certain pressure gradients, which can contribute to the formation of portosystemic shunts in conditions like **portal hypertension** [1]. *Valves are present in the intrahepatic system* - This statement is incorrect; the **intrahepatic portions** of the portal vein, like the rest of the portal system, are **devoid of valves** [1]. - The absence of valves throughout the portal system is crucial for its function as a low-pressure, high-capacity system [1]. *There are about 10-12 valves along the entire course* - This statement is incorrect as the **entire portal venous system is valveless**, in stark contrast to systemic veins, which often contain numerous valves [1]. - The number 10-12 valves is an arbitrary figure and does not reflect the anatomy of the portal system. *Valves are present at the junction of superior mesenteric vein and splenic vein* - This statement is incorrect; the **confluence of the superior mesenteric vein and splenic vein**, which forms the portal vein, is **valveless** [1]. - The absence of valves at this major junction further emphasizes the valveless nature of the entire portal system [1].
Question 329: Which of the following is the terminal group of lymph nodes for the colon?
- A. Paracolic
- B. Epicolic
- C. Preaortic (Correct Answer)
- D. Ileocolic
Explanation: ***Preaortic*** - Lymph from the **colon** eventually drains into the preaortic lymph nodes, which are the **terminal group** for the lymphatic drainage of the large intestine. [1] - These nodes are located along the **aorta** and receive lymphatic flow from various regional lymph node groups of the colon. *Paracolic* - **Paracolic lymph nodes** are located along the mesenteric border of the colon, adjacent to the bowel wall. - They are considered a **regional group** that drains directly from the colon, but they are not the terminal group. *Epicolic* - **Epicolic lymph nodes** are the lymph nodes located on the **surface or within the wall of the colon**. - They represent the **first echelon** of lymphatic drainage but are not the terminal group. *Ileocolic* - **Ileocolic lymph nodes** are specific to the region around the **ileocecal junction**. - While they drain part of the colon (ascending colon and cecum), they are a **regional group** and not the ultimate terminal lymphatic drainage for the entire colon.
Question 330: Most common position of the appendix is?
- A. Pelvic
- B. Retrocaecal (Correct Answer)
- C. Preileal
- D. Postileal
Explanation: ***Retrocaecal*** - The **retrocaecal position** is the most common anatomical location for the appendix, found in approximately **65-70%** of individuals [1]. - In this position, the appendix lies behind the **caecum**, often curving upwards [1]. *Preileal* - In the **preileal position**, the appendix is located in front of the **terminal ileum**. - This position is relatively rare, occurring in about 1% of cases. *Postileal* - The **postileal position** describes the appendix located behind the **terminal ileum**. - This is also a less common variant, occurring in about 2% of individuals. *Pelvic* - The **pelvic position** means the appendix descends into the **pelvis**, often in contact with the bladder or reproductive organs [1]. - This position is the second most common, found in about **30%** of individuals.
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