Systemic Anatomy — MCQs
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Most common position of the appendix is?
All of the following are examples of traction epiphysis except which of the following?
Structure passing along with the aorta through the aortic hiatus of the diaphragm is
The maxillary vein accompanies which artery?
Inferior scapular angle is at what level?
The stomach derives its blood supply from all these arteries directly or indirectly, except for which one?
What is the action of the superior rectus muscle?
Which structure is closely associated with the anterior ethmoidal artery?
What is the average length of the nasolacrimal duct?
What anatomical regions does the transpyloric plane separate?
Systemic Anatomy Indian Medical PG Practice Questions and MCQs
Question 331: 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.
Question 332: All of the following are examples of traction epiphysis except which of the following?
- A. Tubercles of humerus.
- B. Posterior tubercle of talus. (Correct Answer)
- C. Trochanters of femur.
- D. Tibial tuberosity.
Explanation: ***Posterior tubercle of talus*** - The posterior tubercle of the **talus** is not typically considered a traction epiphysis because it's an integral part of the talar body, involved in joint articulation rather than being a site of significant muscle or ligament attachment pulling on a separate ossification center. - While the **flexor hallucis longus** tendon grooves its surface, its primary function and development are not driven by the tensile forces characteristic of traction epiphyses. *Tubercles of humerus* - The **greater and lesser tubercles of the humerus** are classic examples of **traction epiphyses**. - They serve as insertion sites for the **rotator cuff muscles** (supraspinatus, infraspinatus, teres minor, and subscapularis), where strong repetitive pulling forces stimulate their development. *Trochanters of femur* - The **greater and lesser trochanters of the femur** are well-known examples of **traction epiphyses**. - They provide points of attachment for powerful hip and thigh muscles, such as the **gluteal muscles** (greater trochanter) and **iliopsoas** (lesser trochanter), which exert significant traction forces during growth. *Tibial tuberosity* - The **tibial tuberosity** is a prominent example of a **traction epiphysis**. - It serves as the insertion point for the **patellar ligament**, transmitting the force of the **quadriceps femoris** muscle, making it subject to repetitive traction during growth and development.
Question 333: Structure passing along with the aorta through the aortic hiatus of the diaphragm is
- A. Sympathetic trunk
- B. Greater splanchnic nerve
- C. Lesser splanchnic nerve
- D. Thoracic duct (Correct Answer)
Explanation: Thoracic duct - The thoracic duct passes through the aortic hiatus of the diaphragm, along with the aorta and the azygos vein [1], [2]. - This crucial lymphatic vessel is responsible for draining most of the body's lymph into the bloodstream [2]. Sympathetic trunk - The sympathetic trunks typically pass posterior to the diaphragm, but they do not traverse the aortic hiatus with the aorta. - They run vertically along the vertebral column and usually pierce the crura of the diaphragm or pass behind the medial arcuate ligament. Greater splanchnic nerve - The greater splanchnic nerve typically pierces the crus of the diaphragm to enter the abdominal cavity. - It does not pass through the aortic hiatus with the aorta. Lesser splanchnic nerve - Similar to the greater splanchnic nerve, the lesser splanchnic nerve also usually pierces the crus of the diaphragm. - It accompanies the greater splanchnic nerve and does not use the aortic hiatus.
Question 334: The maxillary vein accompanies which artery?
- A. Second part of maxillary artery.
- B. Third part of maxillary artery.
- C. None.
- D. First part of maxillary artery. (Correct Answer)
Explanation: ***First part of maxillary artery*** - The **maxillary vein** is a **vena comitans** that accompanies the first part of the **maxillary artery**. - This anatomical relationship is crucial in understanding the venous drainage of the **deep face** and its connections to the **pterygoid venous plexus**. *Second part of maxillary artery* - The second part of the **maxillary artery** is typically surrounded by the **pterygoid venous plexus**, rather than a single accompanying vein. - The numerous veins of the **pterygoid plexus** form an intricate network around this segment of the artery. *Third part of maxillary artery* - The third part of the **maxillary artery** passes into the **pterygopalatine fossa** and has branches that contribute to the venous drainage of that region, but it is not directly accompanied by the main **maxillary vein**. - Its branches are typically accompanied by smaller veins that drain into the **pterygoid plexus**. *None* - This option is incorrect because the **maxillary vein** does indeed accompany a specific part of the **maxillary artery**. - Understanding these anatomical relationships is fundamental for comprehending vascular pathways in the **head and neck**.
Question 335: Inferior scapular angle is at what level?
- A. T4
- B. T6
- C. T8 (Correct Answer)
- D. T2
Explanation: ***T8*** - The **inferior angle of the scapula** typically lies at the level of the **spinous process of the eighth thoracic vertebra (T8)** when the arm is at rest. - This anatomical landmark is crucial for **palpation** and clinical assessment of the thoracic spine. *T4* - The **spine of the scapula** is generally located at the level of the **spinous process of the third thoracic vertebra (T3)**, not the inferior angle. - T4 is too high to correspond to the inferior scapular angle. *T6* - The **vertebral (medial) border of the scapula** often extends from T2 to T7, with T6 being a mid-point, but not specifically the inferior angle. - While T6 is within the general region of the scapula, it is typically higher than the inferior angle. *T2* - The T2 level corresponds to the superior part of the scapula, near the **superior angle** or the **root of the spine of the scapula**.
Question 336: The stomach derives its blood supply from all these arteries directly or indirectly, except for which one?
- A. Splenic artery
- B. Celiac axis
- C. Hepatic artery
- D. Superior mesenteric artery (Correct Answer)
Explanation: ***Superior mesenteric artery*** - The **superior mesenteric artery (SMA)** primarily supplies the **midgut** derivatives (from the distal duodenum to the proximal two-thirds of the transverse colon), and does not directly or indirectly supply the stomach [2], [3]. - While it may communicate with branches of the celiac axis, it does not contribute to the stomach's vascularization. *Splenic artery* - The **splenic artery** is a direct branch of the celiac trunk and gives rise to the **short gastric arteries** and the **left gastroepiploic artery**, both of which supply the stomach. - The **short gastric arteries** supply the fundus of the stomach, and the **left gastroepiploic artery** supplies the greater curvature. *Hepatic artery* - The **common hepatic artery**, a branch of the celiac trunk, gives rise to the **gastroduodenal artery**, which then gives off the **right gastroepiploic artery** to the stomach’s greater curvature. - The proper hepatic artery then branches into the **right gastric artery**, which supplies the lesser curvature of the stomach. *Celiac axis* - The **celiac axis (celiac trunk)** is the main artery supplying the **foregut** and is the origin of the splenic artery, common hepatic artery, and left gastric artery, all of which directly or indirectly supply the stomach [1], [3]. - It is the primary arterial source for the stomach, spleen, liver, gallbladder, and part of the duodenum [3].
Question 337: What is the action of the superior rectus muscle?
- A. Abduction and intorsion
- B. Adduction and extorsion
- C. Elevation and intorsion (Correct Answer)
- D. Elevation and extorsion
Explanation: ***Elevation and intorsion*** - The primary action of the **superior rectus muscle** is **elevation** of the eyeball [1]. - Its secondary action is **intorsion** (rotation of the top of the eye toward the nose). *Abduction and intorsion* - **Abduction** is primarily performed by the **lateral rectus** muscle [1]. - While intorsion is correct, the combination with abduction makes this option incorrect for the superior rectus's primary and secondary actions. *Adduction and extorsion* - **Adduction** (moving the eye towards the midline) is primarily performed by the **medial rectus** muscle [1]. - **Extorsion** is a primary action of the **inferior oblique** muscle. *Elevation and extorsion* - While **elevation** is correct, **extorsion** (rotation of the top of the eye away from the nose) is incorrect for the superior rectus, as it performs intorsion. - Extorsion is primarily performed by the **inferior oblique** muscle [1], while the **inferior rectus** produces depression with secondary extorsion.
Question 338: Which structure is closely associated with the anterior ethmoidal artery?
- A. Optic nerve
- B. Posterior ethmoidal artery
- C. Nasociliary nerve (Correct Answer)
- D. Recurrent laryngeal nerve
Explanation: ***Nasociliary nerve*** - The **nasociliary nerve** (a branch of the ophthalmic nerve CN V1) enters the orbit through the superior orbital fissure and runs medially to the anterior ethmoidal artery and nerve, often supplying the ethmoid air cells and nasal cavity with sensory innervation. - Both the **anterior ethmoidal artery** and the **nasociliary nerve** pass through the **anterior ethmoidal foramen** in the medial orbital wall, making their anatomical association very close and clinically significant. *Optic nerve* - The **optic nerve** (CN II) transmits visual information from the retina to the brain and is located more posteriorly within the orbit. - While the optic nerve passes close to several orbital structures, its primary association is not directly with the anterior ethmoidal artery which supplies the anterior ethmoid air cells and nasal cavity. *Posterior ethmoidal artery* - The **posterior ethmoidal artery** is a separate branch of the ophthalmic artery that enters the ethmoid labyrinth through the **posterior ethmoidal foramen**. - Although both are ethmoidal arteries, their entry points into the ethmoid region are distinct, and they supply different parts of the ethmoid air cells and nasal cavity without having a direct close relationship in their course. *Recurrent laryngeal nerve* - The **recurrent laryngeal nerve** is a branch of the vagus nerve (CN X) and is located in the neck and thorax, innervating most intrinsic muscles of the larynx. - This nerve has no anatomical or functional association with the orbit or the anterior ethmoidal artery.
Question 339: What is the average length of the nasolacrimal duct?
- A. 16 mm
- B. 15 mm (Correct Answer)
- C. 17 mm
- D. 14 mm
Explanation: ***15 mm*** - The nasolacrimal duct typically measures about **15 mm** in length in adults. - This length allows it to effectively drain tears from the **lacrimal sac** into the nasal cavity. *16 mm* - While close, **16 mm** is slightly longer than the generally accepted average length for the **nasolacrimal duct**. - Variations exist, but 15 mm is the most commonly cited average in anatomical texts. *17 mm* - **17 mm** is considered an anatomical variation at the longer end of the spectrum for the **nasolacrimal duct**. - This length is less common as an average measurement. *14 mm* - **14 mm** is slightly shorter than the typical average length of the **nasolacrimal duct**. - While within a normal range, it is not the most precise average measurement found in anatomy.
Question 340: What anatomical regions does the transpyloric plane separate?
- A. Hypogastrium from hypochondrium
- B. Hypochondrium from lumbar region (Correct Answer)
- C. Iliac fossa from lumbar region
- D. Umbilical region from lumbar region
Explanation: ***Hypochondrium from lumbar region*** - The **transpyloric plane** is an imaginary horizontal line that passes through the **pylorus of the stomach** and the tips of the ninth costal cartilages. - This plane separates the **upper lateral abdominal regions** (hypochondria) from the **middle lateral abdominal regions** (lumbar regions) on each side. *Hypogastrium from hypochondrium* - The **hypogastrium** is inferior to the umbilical region, while the **hypochondria** are located in the upper lateral parts of the abdomen. - These regions are separated by the **subcostal plane**, not the transpyloric plane. *Iliac fossa from lumbar region* - The **iliac fossa** is located in the lower lateral part of the abdomen, while the **lumbar region** is in the middle lateral part. - These specific regions are primarily divided by the **intertubercular plane**, which is inferior to the transpyloric plane. *Umbilical region from lumbar region* - The **umbilical region** is the central area of the abdomen around the umbilicus, and the **lumbar regions** are lateral to it. - The transpyloric plane transverses the upper part of the umbilical region but does not primarily serve to separate the umbilical from the lumbar regions.
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