Surface and Radiological Anatomy Practice Questions

Q: To what level of vertebrae does the marked structure correspond?

At the junction of L3 & L4. ***At the junction of L3 & L4*** - The umbilicus, indicated by the arrow, is a key surface landmark that typically corresponds to the level of the **intervertebral disc** between the **L3 and L4 vertebrae**. - This anatomical relationship is important for clinical procedures, as the **supracristal plane** (a line between the iliac crests) crosses near the L4 vertebra, helping to landmark sites for **lumbar puncture**. *At the junction of L1 & L2* - This vertebral level corresponds to the **transpyloric plane**, which is a different landmark located superior to the umbilicus. - Important structures at the L1/L2 level include the **pylorus of the stomach**, the hila of the kidneys, and the termination of the spinal cord (**conus medullaris**) in adults. *At the junction of L2 & L3* - This level is superior to the anatomical position of the umbilicus. - It corresponds to the location of the inferior border of the third part of the **duodenum** and the origin of the **inferior mesenteric artery** is often around L3. *At the junction of T12 & L1* - This is a much higher vertebral level, associated with the origin of the **celiac trunk** and the **superior mesenteric artery** from the abdominal aorta. - It is located significantly superior to the umbilicus and is near the **diaphragmatic hiatus** for the aorta.

Q: On palpation at the site marked by the red arrow on the image, a bony ridge is felt. What is the vertebral level of the marked arrow?

T4-T5 intervertebral disc. ***T4-T5 intervertebral disc*** - The arrow points to the **sternal angle** (Angle of Louis), which is the palpable transverse ridge at the junction of the **manubrium** and the **body of the sternum**. - This important anatomical landmark is located at the level of the **intervertebral disc** between the **T4 and T5** thoracic vertebrae and marks the site of articulation of the **second costal cartilage**. *T3-T4 intervertebral disc* - This vertebral level is superior to the sternal angle. - The **spine of the scapula** is a surface landmark that corresponds approximately to the level of the **T3** vertebra. *T2-T3 intervertebral disc* - This vertebral level is significantly superior to the location marked. - The **suprasternal notch** (jugular notch) of the manubrium corresponds to the level of the intervertebral disc between **T2 and T3**. *T5-T6 intervertebral disc* - This level is inferior to the sternal angle. - It would correspond to a point lower on the body of the sternum, rather than the manubriosternal junction.

Q: Identify the rib highlighted in the X-ray.

3rd rib posterior part. ***3rd rib posterior part*** - On a posteroanterior (PA) chest X-ray, the **posterior ribs** are more prominent and have a more horizontal orientation as they articulate with the thoracic vertebrae, which matches the highlighted structure. - When counting from the top, the first rib is the highest and most curved. The highlighted rib is clearly the third one down from the apex of the thorax, confirming it as the **3rd posterior rib**. *3rd rib anterior part* - The **anterior parts** of the ribs are more difficult to visualize and course downwards and medially towards the sternum. The highlighted rib is oriented horizontally. - Anterior ribs connect to the sternum via **costal cartilage**, which is not as radiopaque as bone and thus appears less distinct on an X-ray than the highlighted structure. *4th rib anterior part* - This option is incorrect as the highlighted structure is a **posterior rib**, not an anterior one, based on its orientation. - Additionally, counting reveals the rib to be the third, not the fourth. The **fourth rib** would be located inferior to the highlighted one. *1st rib anterior part* - The **1st rib** is the most superior and has a very sharp curvature, often partially obscured by the clavicle. The highlighted rib is located below the first and second ribs. - This is also incorrect because the image highlights the **posterior aspect** of a rib, not the anterior aspect.

Q: In the given barium swallow image, which of the following shows the left atrium impression on the esophagus?

3. ***Correct: Option 3*** - This pointer correctly identifies the impression on the esophagus caused by the **left atrium**, which is the most posterior chamber of the heart. - An enlarged left atrium, often seen in conditions like **mitral stenosis**, can cause a prominent posterior indentation on the esophagus at this level. - The left atrium impression is typically seen at the level of T4-T6 vertebrae on barium swallow studies. *Incorrect: None of them* - This option is incorrect as the image clearly shows normal anatomical impressions on the esophagus, and pointer 3 correctly identifies the left atrial impression. - A barium swallow is a standard radiological procedure to visualize these impressions from adjacent cardiovascular structures. *Incorrect: Option 1* - This pointer indicates the impression of the **aortic arch**, which is the first and most superior indentation seen on a lateral or oblique view of a barium swallow. - The aortic arch crosses the esophagus on its left side at approximately T4 level, creating a distinct notch as it arches posteriorly. *Incorrect: Option 2* - This pointer shows the impression made by the **left main bronchus** as it crosses anterior to the esophagus. - This indentation is located inferior to the aortic arch impression at approximately T5 level and is typically less pronounced than the aortic or left atrial impressions.

Q: Identify the anatomical structure shown in the image.

Transverse sinus. ***Transverse sinus*** - The image shows a venogram with the highlighted structure corresponding to the **transverse sinus**, a large dural venous sinus located in the posterior cranial fossa - The transverse sinus extends **laterally from the confluence of sinuses** along the attached margin of the tentorium cerebelli - It curves anteroinferiorly to become the **sigmoid sinus** at the posterolateral corner of the petrous temporal bone - Drains blood from the superior sagittal sinus and straight sinus via the confluence of sinuses *Incorrect: Superior sagittal sinus* - The superior sagittal sinus runs in the **midline along the superior border** of the falx cerebri - On venogram, it appears as a **midline vertical structure**, not the lateral structure shown - Drains into the confluence of sinuses but has a different anatomical course *Incorrect: Sigmoid sinus* - The sigmoid sinus is the **continuation of the transverse sinus** - It follows an **S-shaped course** descending to the jugular foramen - Located more **anteroinferiorly** than the structure shown in the image *Incorrect: Straight sinus* - The straight sinus runs **posteriorly in the midline** along the junction of falx cerebri and tentorium cerebelli - Drains into the confluence of sinuses but is **not laterally positioned** like the structure shown - On venogram, it appears more posterior and vertical compared to the transverse sinus

Q: Identify the marked blood vessel in the image.

Internal carotid artery. ***Internal carotid artery*** - The image shows a **magnetic resonance angiography (MRA)** of the cerebral vasculature displaying the Circle of Willis - The marked vessel (number 6) represents the **internal carotid artery** as it enters the cranial cavity after emerging from the neck - This segment is located **before the ICA bifurcates** into the middle and anterior cerebral arteries - The anatomical position and course are characteristic of the **supraclinoid segment** of the internal carotid artery *Incorrect: Middle cerebral artery* - The middle cerebral artery is a **terminal branch** of the internal carotid artery, not the parent vessel - It courses laterally through the **lateral sulcus (Sylvian fissure)** rather than ascending vertically - Would be located more **superiorly and laterally** in this view *Incorrect: Anterior cerebral artery* - The anterior cerebral artery is also a **terminal branch** of the internal carotid artery - It courses **medially and anteriorly** above the optic nerve, not in the position shown - Typically appears as a **smaller caliber vessel** compared to the parent ICA *Incorrect: Basilar artery* - The basilar artery is part of the **posterior circulation**, formed by vertebral arteries - Located in the **midline at the base of the pons**, posterior to the Circle of Willis - Would be seen in the **posterior aspect** of the image, not in the lateral supraclinoid position marked

Q: The structure shown below is:

Left ureter. ***Left ureter*** - The arrow points to a tubular structure originating from the left kidney and descending towards the pelvis, which is consistent with the anatomical course of the **left ureter**. - Its relatively thin, unbranched appearance distinguishes it from major blood vessels in this region. *Left renal artery* - The **left renal artery** would originate directly from the aorta, usually superior to the structure indicated, and would be a wider, more prominent vascular structure heading towards the kidney. - Renal arteries carry oxygenated blood and appear as high-density structures on contrast-enhanced CT, but the pointed structure is too inferior and thin. *Left common iliac artery* - The **left common iliac artery** is a large artery forming from the bifurcation of the aorta, typically lower in the abdomen, near the sacrum, and would be much wider and brighter on a contrast-enhanced CT. - The indicated structure is much thinner and more superior than where the common iliac artery typically begins. *Left inferior mesenteric vein* - The **left inferior mesenteric vein** usually drains into the splenic vein or directly into the superior mesenteric vein or portal vein, located more superiorly and medially than the structure indicated. - While tubular, its anatomical course and typical size do not match the structure pinpointed by the arrow, which appears to connect to the kidney.

Q: Name the structure marked as $X$ in the CT abdomen shown below: (Recent NEET Pattern 2016-17)

Inferior vena cava. ***Inferior vena cava*** - The structure marked as X is located to the **right of the aorta** and is typically seen as a large, relatively **thin-walled vessel**. - Its position anterior and to the right of the vertebral body, draining into the heart, is consistent with the **inferior vena cava (IVC)**. *Pancreas* - The pancreas is typically located more anteriorly and superiorly in this cross-section, usually nestled between the duodenum and spleen. - It would appear as a **glandular organ** with a different texture and position on a CT scan. *Aorta* - The aorta is typically the **larger, thick-walled, pulsatile vessel** located to the **left of the vertebral body** and to the left of the structure marked X. - It usually appears circular in cross-section and is often seen with higher attenuation due to arterial contrast. *Left renal vein* - The left renal vein typically arises from the left kidney and crosses the midline to drain into the IVC, passing **anterior to the aorta**. - The structure marked X is the IVC itself, which receives the left renal vein, rather than the left renal vein.

Q: The area marked in CT scan is:

Mammillary body. ***Mammillary body*** - The arrow points to a small, rounded structure located on the **ventral surface of the hypothalamus**, characteristic of the mammillary body - Mammillary bodies are part of the **limbic system** and play a crucial role in **memory formation** and **recollection** - These paired structures are visible on midsagittal brain imaging as small rounded projections *Massa Intermedialis* - The massa intermedia (interthalamic adhesion) is a flattened band of tissue connecting the two halves of the **thalamus** across the third ventricle - Located more **superiorly and centrally** within the diencephalon, not ventrally as shown *Pons* - The pons is a larger, bulbous structure located anterior to the **cerebellum** and superior to the medulla, forming part of the brainstem - It is much more **posterior and inferior** to the marked area *Clivus* - The clivus is a **bony structure** at the skull base, formed by the **sphenoid** and **occipital bones** - It is a radiological landmark but represents bone, not brain parenchyma as indicated by the arrow

Question 1

To what level of vertebrae does the marked structure correspond?

Accepted Answer

At the junction of L3 & L4

Answer

At the junction of L1 & L2

Answer

At the junction of L2 & L3

Answer

At the junction of T12 & L1

Question 2

On palpation at the site marked by the red arrow on the image, a bony ridge is felt. What is the vertebral level of the marked arrow?

Accepted Answer

T4-T5 intervertebral disc

Answer

T5-T6 intervertebral disc

Answer

T3-T4 intervertebral disc

Answer

T2-T3 intervertebral disc

Question 3

Identify the rib highlighted in the X-ray.

Accepted Answer

3rd rib posterior part

Answer

4th rib anterior part

Answer

3rd rib anterior part

Answer

1st rib anterior part

Question 4

In the given barium swallow image, which of the following shows the left atrium impression on the esophagus?

Accepted Answer

3

Answer

None of them

Answer

1

Answer

2

Question 5

The following procedure is being performed. Identify the markings:

Accepted Answer

A = Sternocleidomastoid muscle, B = Thyroid cartilage, C = Cricoid cartilage

Answer

A = Sternocleidomastoid muscle, B = Cricoid cartilage, C = Thyroid cartilage

Answer

A = Cricoid cartilage, B = Sternocleidomastoid muscle, C = Thyroid cartilage

Answer

A = Thyroid cartilage, B = Cricoid cartilage, C = Sternocleidomastoid muscle

Question 6

Identify the anatomical structure shown in the image.

Accepted Answer

Transverse sinus

Answer

Superior sagittal sinus

Answer

Sigmoid sinus

Answer

Straight sinus

Question 7

Identify the marked blood vessel in the image.

Accepted Answer

Internal carotid artery

Answer

Middle cerebral artery

Answer

Anterior cerebral artery

Answer

Basilar artery

Question 8

The structure shown below is:

Accepted Answer

Left ureter

Answer

Left renal artery

Answer

Left common iliac artery

Answer

Left inferior mesenteric vein

Question 9

Name the structure marked as $X$ in the CT abdomen shown below: (Recent NEET Pattern 2016-17)

Accepted Answer

Inferior vena cava

Answer

Pancreas

Answer

Aorta

Answer

Left renal vein

Question 10

The area marked in CT scan is:

Accepted Answer

Mammillary body

Answer

Massa Intermedialis

Answer

Pons

Answer

Clivus

Surface and Radiological Anatomy — MCQs

Surface and Radiological Anatomy — MCQs

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