Vascular Anatomy — MCQs
Which of the following is not a branch of the inferior mesenteric artery?
Superior vena cava develops from?
The tributaries of the inferior vena cava include all of the following, except:
Which of the following arteries is a branch of the facial artery?
Ophthalmic artery is a branch of which part of the internal carotid artery?
Which of the following represents a common variation in the arteries arising from the arch of the aorta?
Which of the following statements about the first part of the duodenum is false?
Caldwell’s view is used for:
Liver is divided into eight segments according to Couinaud's classification based upon
Identify the structure shown in CT abdomen section. (Recent NEET Pattern 2018-19)
Vascular Anatomy Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is not a branch of the inferior mesenteric artery?
- A. Left colic
- B. Middle rectal (Correct Answer)
- C. Superior rectal
- D. Sigmoidal artery
Explanation: ***Middle rectal artery*** - The **middle rectal artery** [2] is typically a branch of the **internal iliac artery** [2], supplying the middle part of the rectum. - It is not a direct branch of the inferior mesenteric artery. *Left colic artery* - The left colic artery is a direct branch of the **inferior mesenteric artery** [1], supplying the distal transverse colon and descending colon. - It forms an important anastomosis with the middle colic artery [1]. *Superior rectal artery* - The **superior rectal artery** is the terminal branch of the **inferior mesenteric artery**, supplying the upper rectum. - This artery provides the primary arterial supply to the proximal large intestine structures. *Sigmoidal artery* - The **sigmoidal arteries** are typically 2-4 branches arising from the **inferior mesenteric artery**, supplying the sigmoid colon. - These arteries anastomose with branches of the superior rectal and left colic arteries.
Question 2: Superior vena cava develops from?
- A. Right anterior cardinal vein (Correct Answer)
- B. Left anterior cardinal vein
- C. Left common cardinal vein
- D. Right subcardinal vein
Explanation: Right anterior cardinal vein - The superior vena cava (SVC) forms from the right anterior cardinal vein and the common cardinal vein. - The right anterior cardinal vein directly contributes to the upper portion of the SVC. Left anterior cardinal vein - The left anterior cardinal vein typically regresses or becomes minor tributaries like the left SVC (if persistent) or the coronary sinus. - It does not form the main superior vena cava. Left common cardinal vein - The left common cardinal vein forms the coronary sinus and an oblique vein of the left atrium. - While major vessels drain into it, it does not directly form the superior vena cava. Right subcardinal vein - The right subcardinal vein is primarily involved in the development of the inferior vena cava (IVC), particularly its renal segment. - It does not contribute to the formation of the superior vena cava.
Question 3: The tributaries of the inferior vena cava include all of the following, except:
- A. Left renal vein
- B. Left gonadal vein (Correct Answer)
- C. Hepatic vein
- D. Right suprarenal vein
Explanation: ***Left gonadal vein*** - The **left gonadal vein** (either testicular or ovarian) drains into the **left renal vein** before reaching the inferior vena cava. - It is **NOT a direct tributary** of the IVC, which is why it is the correct answer to this "except" question. - This anatomical arrangement distinguishes it from the **right gonadal vein**, which drains directly into the IVC. *Left renal vein* - The **left renal vein** is a **direct and major tributary** of the inferior vena cava (IVC). - It receives blood from the **left gonadal vein** and the **left suprarenal vein** before emptying into the IVC. [1] - This vein crosses anterior to the aorta to reach the IVC. *Hepatic vein* - The **hepatic veins** (typically three major veins: right, middle, and left) drain blood from the liver **directly into the IVC**. - They are essential for returning filtered blood from the liver to the systemic circulation. [2] - These veins have a very short course before entering the IVC just below the diaphragm. *Right suprarenal vein* - The **right suprarenal vein** drains **directly into the IVC**, similar to the right gonadal vein. [3] - In contrast, the **left suprarenal vein** drains into the left renal vein (indirect tributary), following the same asymmetric pattern as the gonadal veins.
Question 4: Which of the following arteries is a branch of the facial artery?
- A. Infraorbital, dorsal nasal, deep facial, mental
- B. Ascending palatine, superficial temporal, submental, inferior labial
- C. Superior thyroid, lingual, facial, maxillary
- D. Inferior labial, superior labial, lateral nasal, angular (Correct Answer)
Explanation: ***Inferior labial, superior labial, lateral nasal, angular*** - The **facial artery** is a major branch of the **external carotid artery** that supplies the face. - Its key branches include the **inferior labial**, **superior labial**, **lateral nasal**, and **angular arteries**, which contribute to the blood supply of the lips, nose, and medial canthus of the eye. *Ascending palatine, superficial temporal, submental, inferior labial* - The **superficial temporal artery** is a terminal branch of the **external carotid artery**, not the facial artery. - While the **ascending palatine** and **submental arteries** are branches of the facial artery, including the superficial temporal artery makes this option incorrect. *Infraorbital, dorsal nasal, deep facial, mental* - The **infraorbital artery** and **mental artery** are branches of the **maxillary artery**, which is another branch of the external carotid artery, not the facial artery. - The **dorsal nasal artery** is typically a terminal branch of the **ophthalmic artery**, which arises from the internal carotid artery. *Superior thyroid, lingual, facial, maxillary* - These are all **major branches of the external carotid artery** itself, not branches of the facial artery. - The question specifically asks for branches *of* the facial artery.
Question 5: Ophthalmic artery is a branch of which part of the internal carotid artery?
- A. Cavernous
- B. Cervical
- C. Petrous
- D. Cerebral (Correct Answer)
Explanation: ***Cerebral (Supraclinoid)*** - The **ophthalmic artery** is the first major branch of the **cerebral (supraclinoid/C6) segment** of the internal carotid artery. - It arises **immediately after** the ICA pierces the dura mater and exits the cavernous sinus, entering the **subarachnoid space**. - The ophthalmic artery enters the orbit through the **optic canal** alongside the optic nerve, supplying the eye and orbital structures. - This is the **most clinically important branch** arising from this segment before the terminal bifurcation into anterior and middle cerebral arteries. *Cavernous* - The **cavernous segment (C4)** courses through the cavernous sinus and gives rise to small branches like the **meningohypophyseal trunk** and **inferolateral trunk**. - These branches supply the pituitary gland, cranial nerves, and dura mater. - The ophthalmic artery does **NOT** arise from this segment; it arises after the ICA exits the cavernous sinus. *Cervical* - The **cervical segment (C1)** extends from the common carotid bifurcation to the entrance of the carotid canal at the skull base. - This segment typically has **no branches**, serving primarily as a conduit. - The ophthalmic artery arises much more superiorly, intracranially. *Petrous* - The **petrous segment (C2)** lies within the petrous part of the temporal bone in the carotid canal. - It gives rise to small branches like the **caroticotympanic** and **vidian arteries** that supply the middle ear and pterygoid canal. - The ophthalmic artery is not a branch of this segment.
Question 6: Which of the following represents a common variation in the arteries arising from the arch of the aorta?
- A. Absence of brachiocephalic trunk
- B. Left vertebral artery arising from the arch
- C. Presence of retroesophageal subclavian artery
- D. Left common carotid artery arising from brachiocephalic trunk (Correct Answer)
Explanation: ***Left common carotid artery arising from brachiocephalic trunk*** - Normally, the **brachiocephalic trunk** gives rise to the right subclavian and right common carotid arteries, while the left common carotid and left subclavian arteries arise directly from the aortic arch. - However, in this common variation (sometimes called a **bovine arch**), the left common carotid artery originates from the brachiocephalic trunk, reducing the number of direct branches from the arch to two. *Absence of brachiocephalic trunk* - The **brachiocephalic trunk** is one of the three major vessels normally arising from the aortic arch [1]. Its absence is a very rare and significant anomaly, not a common variation. - This would imply direct origins for the right subclavian and right common carotid arteries from the aortic arch, which is not typical. *Left vertebral artery arising from the arch* - The **left vertebral artery** typically arises from the first part of the **left subclavian artery**. - Its direct origin from the aortic arch is a known anatomical variant, but it is less common than the left common carotid artery arising from the brachiocephalic trunk. *Presence of retroesophageal subclavian artery* - A **retroesophageal subclavian artery** (usually the right subclavian artery) is a congenital anomaly where the artery takes an abnormal course behind the esophagus [1]. - While it is a recognized variant, it is considered less common than the "bovine arch" configuration.
Question 7: Which of the following statements about the first part of the duodenum is false?
- A. 5 cm long
- B. Is superior part
- C. Develops from foregut
- D. Supplied by the superior mesenteric artery (Correct Answer)
Explanation: ***Supplied by the superior mesenteric artery*** - The first part of the duodenum, derived from the **foregut**, receives its blood supply from the **gastroduodenal artery**, a branch of the celiac artery [1], [2]. - The **superior mesenteric artery** primarily supplies the **midgut** derivatives, which include the distal half of the duodenum and onward [2]. *5 cm long* - The first part of the duodenum is indeed the **shortest** and widest section, typically measuring about **5 cm (2 inches)** in length. - This length allows it to course from the pylorus to the inferior border of the L1 vertebra. *Is superior part* - This statement is correct as the first part courses **superiorly** and then posteriorly, crossing the right crus of the diaphragm. - It lies at the level of the **L1 vertebra**. *Develops from foregut* - The first part of the duodenum, along with the other upper gastrointestinal structures (stomach, liver, pancreas), indeed develops from the **embryonic foregut** [1]. - The transition from foregut to midgut occurs at the level of the **major duodenal papilla**.
Question 8: Caldwell’s view is used for:
- A. Maxillary sinus
- B. Frontal sinus (Correct Answer)
- C. Ethmoidal sinus
- D. Sphenoid sinus
Explanation: ***Frontal sinus*** - The Caldwell view is a **posteroanterior (PA) radiographic projection** of the skull, specifically designed to visualize the **frontal sinuses** and anterior ethmoid air cells. - In this view, the X-ray beam is angled at 15-20 degrees caudally to the orbitomeatal line, allowing for good visualization of the frontal sinuses above the orbital structures. *Maxillary sinus* - The **Waters view (occipitomental view)** is primarily used for optimal visualization of the **maxillary sinuses**, providing a clear view free from superimposition of the petrous ridges. - While portions of the maxillary sinuses may be visible on a Caldwell view, it is not the primary or best projection for them. *Ethmoidal sinus* - The Caldwell view offers some visualization of the **anterior ethmoidal air cells**, but the **posterior ethmoidal air cells** are better seen on other views like the **lateral view** or specialized CT scans. - The **lateral view** provides a good overall view of all paranasal sinuses, including the ethmoid, but not with the specific clarity for the anterior ethmoids that Caldwell provides. *Sphenoid sinus* - The **sphenoid sinus** is best visualized on **lateral skull radiographs** or **submentovertex (base) view**, where it can be seen centrally located posterior to the nasal cavity. - The Caldwell view does not provide adequate visualization of the sphenoid sinus due to superimposition of other structures and the anatomical position of the sphenoid sinus deep in the skull base.
Question 9: Liver is divided into eight segments according to Couinaud's classification based upon
- A. Portal vein (Correct Answer)
- B. Hepatic artery
- C. Hepatic vein
- D. Bile Duct
Explanation: ***Portal vein*** - Couinaud's classification divides the liver into eight segments, each supplied by a single portal triad (a branch of the **portal vein**, **hepatic artery**, and drained by a branch of the bile duct) [1]. - The portal vein branches are central to the segmentation as they dictate the functional units based on their intrahepatic distribution [1]. *Hepatic artery* - While the hepatic artery provides arterial blood supply to each segment, it is the distribution of the **portal vein** that primarily defines the surgical segments in Couinaud's classification. - The hepatic arterial supply tends to run alongside the portal vein branches but doesn't alone dictate the segmentation boundaries. *Hepatic Vein* - The hepatic veins typically run **intersegmentally**, defining the boundaries between segments rather than actually supplying them [1]. - They are used as landmarks to identify the different segments but not as the basis for the segmental division itself. *Bile Duct* - The bile ducts run in parallel with the portal vein and hepatic artery branches within each segment. - Although crucial for drainage, their branching pattern does not independently form the basis for Couinaud's segmental classification.
Question 10: Identify the structure shown in CT abdomen section. (Recent NEET Pattern 2018-19)
- A. Inferior vena cava
- B. Portal vein (Correct Answer)
- C. Splenic vein
- D. Superior mesenteric vein
Explanation: ***Portal vein*** - The arrow points to a vessel receiving blood from the splenic and superior mesenteric veins, which is characteristic of the **portal vein** entering the **liver parenchyma**. - The portal vein is typically seen anterior to the **inferior vena cava** and posterior to the **common hepatic artery** at this level. *Inferior vena cava* - The **inferior vena cava (IVC)** is a large, retroperitoneal vessel located posterior to the liver and to the right of the aorta. - The structure indicated by the arrow is clearly within the liver substance, not in the typical position of the IVC. *Splenic vein* - The **splenic vein** runs horizontally behind the body of the pancreas and joins with the superior mesenteric vein to form the portal vein. - The vessel shown is within the liver, distal to the formation of the portal vein. *Superior mesenteric vein* - The **superior mesenteric vein (SMV)** typically runs vertically in the mesentery and joins the splenic vein to form the portal vein. - The indicated structure is within the liver hilum, not in the anatomical location of the SMV.
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