Surface and Radiological Anatomy Practice Questions

Q: When a lumbar puncture is performed to sample cerebrospinal fluid, which of the following external landmarks is the most reliable to determine the position of the L4 vertebral spine?

The iliac crests. ***The iliac crests*** - A line drawn between the **highest points of the iliac crests** on both sides typically intersects the L4 vertebral body or the L4-L5 intervertebral space. - This anatomical landmark provides a **safe entry point** for lumbar puncture, avoiding the spinal cord which usually ends at L1-L2. *The lowest pair of ribs bilaterally* - The lowest pair of ribs (12th ribs) corresponds to the **twelfth thoracic vertebra (T12)**, which is much higher than the desired lumbar puncture site. - Using this landmark would place the needle at a level where the **spinal cord is still present**, posing a significant risk of injury. *The inferior angles of the scapulae* - The inferior angle of the scapula typically corresponds to the **seventh thoracic vertebra (T7)**. - This landmark is also too superior for a safe lumbar puncture and does not accurately localize the lumbar spine. *The posterior superior iliac spines* - The posterior superior iliac spines (PSIS) are located at the level of the **S2 vertebra**, which is too far inferior for a standard lumbar puncture at L4-L5. - While they are important pelvic landmarks, they are not used for determining the L4 vertebral spine in this context.

Q: Number of carpal bones seen in a radiograph of an infant is:

2. ***Correct: 2*** - During infancy, only the **capitate** and **hamate** carpals have begun to ossify and are visible on X-rays. - The remaining carpal bones ossify at later ages during childhood. - This is the expected finding in a normal infant radiograph. *Incorrect: 5* - Five carpal bones are usually visible in radiographs of children around **1 year of age**, but not typically in infants. - This number would imply significant early ossification beyond what is expected at birth. *Incorrect: 3* - Three carpal bones might be visible in later infancy or early childhood, but not typically at birth. - The **triquetrum** is usually the third carpal bone to ossify (around 2-3 years). *Incorrect: 0* - It is uncommon for **zero carpal bones** to be visible in a radiograph of a healthy infant. - The **capitate and hamate** are usually present at birth or shortly after, making zero an unlikely finding.

Q: Lymph nodes of which area are not easily palpable?

Abdomen. ***Abdomen*** - **Intra-abdominal lymph nodes** are located deep within the body cavity, often surrounded by organs and fatty tissue, making them difficult or impossible to palpate externally. - Their assessment typically requires **imaging techniques** such as CT scans, MRI, or ultrasound [1]. *Neck* - **Cervical lymph nodes** are superficial and easily accessible for palpation along the jawline, posterior triangle, and anterior neck. - They are routinely examined during physical assessments, especially concerning head and neck infections or malignancies [2]. *Groin* - **Inguinal lymph nodes** are located superficially in the groin region, easily palpable below the inguinal ligament. - They are commonly assessed for signs of infection or malignancy affecting the lower extremities or genital area. *Axilla* - **Axillary lymph nodes** are situated in the armpit and are also relatively superficial, making them readily palpable. - They are crucial in the assessment of breast cancer and infections or malignancies of the upper limb.

Q: The ring is denoting the location of?

Tricuspid valve. ***Tricuspid valve*** - The image likely displays a **cardiac outline** on an X-ray, and the ring points to the typical location of the **tricuspid valve** within the right side of the heart. - The tricuspid valve separates the **right atrium** from the **right ventricle**. *Pulmonary valve* - The pulmonary valve is located anterior and to the left of the tricuspid valve, separating the **right ventricle** from the **pulmonary artery**. - Its position is generally superior and more towards the midline compared to the ring's location. *Mitral valve* - The mitral valve is situated on the **left side of the heart**, between the **left atrium** and **left ventricle**. - Its location is distinctly different from the highlighted area. *Aortic valve* - The aortic valve is located between the **left ventricle** and the **aorta**, typically found superior and central in relation to the cardiac silhouette. - This position is away from the area indicated by the ring.

Q: The following radiograph shows:

Gemination in 22. ***Gemination in 22*** - **Gemination** occurs when an abnormal tooth develops due to the **attempted division of a single tooth bud**, resulting in a tooth with a single root and root canal, but a **bifid crown**. - The radiograph would show a **single enlarged pulp chamber** and a single root, characteristic of a geminated tooth. *Fusion in 22* - **Fusion** involves the union of **two separate tooth buds**, leading to a large, often misshapen tooth with **two distinct pulp canals** and usually two separate roots. - While it also results in an enlarged crown, the presence of **two distinct pulp chambers and roots** distinguishes it from gemination. *Concrescence in 22* - **Concrescence** is a form of fusion that occurs after root formation is complete, where **two adjacent teeth are united by cementum only**. - This condition is typically observed in **molars** and does not involve the fusion of the crown or enamel, making it distinct from the morphology shown in the image. *Dilaceration in 21* - **Dilaceration** refers to an **abnormal bend or curve in the root or crown of a tooth**, which is often caused by trauma during tooth development. - The image does not show any significant angular displacement or severe bend in the root or crown of tooth 21, thus making this option incorrect.

Q: The landmark shown here is

Tuffier’s line. ***Tuffier's line*** - **Tuffier's line**, also known as the intercristal line, connects the highest points of the **iliac crests**. - This line typically corresponds to the level of the **L4 vertebral body** or the L4-L5 intervertebral space, which is an important landmark for lumbar punctures. *Nelaton's line* - **Nelaton's line** is drawn from the **anterior superior iliac spine** to the **ischial tuberosity** of the same side. - It is used to assess for superior displacement of the greater trochanter in conditions like **hip dislocation** or **femoral neck fracture**. *Transpyloric plane* - The **transpyloric plane** is a horizontal plane located halfway between the **suprasternal notch** and the **pubic symphysis**. - It typically passes through the **pylorus of the stomach**, the neck of the pancreas, and the hila of the kidneys, corresponding to the level of the **L1 vertebral body**. *Shenton's line* - **Shenton's line** is an arc formed by the medial margin of the **femoral neck** and the inferior margin of the superior pubic ramus and obturator foramen. - It is used to assess for integrity of the **femoral neck-shaft angle** and is commonly broken in cases of hip dislocation or femoral neck fractures.

Q: Which of the following represents the surface marking of aortic valve?

Sternal end of left 3rd costal cartilage. ***Sternal end of left 3rd costal cartilage*** - The **aortic valve** is anatomically located behind the **left half of the sternum** at the level of the **3rd costal cartilage**. - This is the **surface marking** representing the actual anatomical position of the valve. - The aortic valve lies posterior to the sternum, and its surface projection corresponds to the left border of the sternum at the 3rd intercostal space [1]. *Besides sternum in right 2nd intercostal space* - This location represents the **auscultation area** for the aortic valve, not its surface marking. - Auscultation points differ from anatomical surface markings because heart sounds are transmitted along the direction of blood flow. - The aortic valve sound is best heard at the right 2nd intercostal space, but the valve itself is not located there. *Sternal end of right 3rd costal cartilage* - This does not correspond to the surface marking of the aortic valve. - The aortic valve is positioned more to the left side of the sternum [1]. *Besides the sternum in the right 3rd intercostal space* - This location does not represent the surface marking of any of the cardiac valves accurately. - The aortic valve's anatomical position is at the left 3rd costal cartilage level, not the right side.

Q: In an ultrasound of the abdomen, which structure is best seen posterior to the stomach?

Pancreas. ***Pancreas*** - The **pancreas** is retroperitoneal and lies transversely across the posterior abdominal wall, making it located directly posterior to the stomach. - In ultrasound, the stomach, when filled with fluid, can act as an acoustic window to visualize the pancreas behind it. *Gallbladder* - The **gallbladder** is typically nestled in a fossa on the inferior surface of the liver, anterior to the duodenum and often anterior or inferior to the stomach [1]. - It is not positioned directly posterior to the stomach, but rather more to the right and inferior [1]. *Spleen* - The **spleen** is located in the left upper quadrant, superior and posterior to the stomach, but typically more lateral and posterior than directly behind it. - While it has a close relationship with the stomach, it is usually not considered "best seen posterior to the stomach" in the same straight-on fashion as the pancreas. *Liver* - The **liver** is primarily located in the right upper quadrant, largely anterior and superior to the stomach. - While a small portion of the left lobe of the liver can be anterior to the stomach, the bulk of the liver is not posterior to it.

Q: The marked area in the image is supplied by which dermatome?

T10. ***T10*** - The **umbilicus** (navel) is a crucial anatomical landmark for dermatome mapping. - The area around the umbilicus is consistently innervated by the **T10 dermatome**. *T8* - The **T8 dermatome** is located higher on the abdomen, typically around the **xiphoid process**. - It would be too superior to supply the umbilical region. *T9* - The **T9 dermatome** is situated between T8 and T10, above the umbilicus. - It generally covers the region just **above the navel**, but not the navel itself. *T11* - The **T11 dermatome** is located below the umbilicus, closer to the **inguinal region**. - It would be too inferior to innervate the umbilical area.

Q: In the following X-ray of the wrist, what is the exact age of the child?

6 years. ***6 years*** - The appearance of **ossification centers** in the carpals and epiphysis of long bones of the hand and wrist indicates a bone age of approximately 6 years. Key markers for this age include the presence of **capitate, hamate, triquetrum, lunate, scaphoid, and trapezium** ossification centers, as well as the initial appearance of the **distal radial epiphysis** and **epiphyses of phalanges and metacarpals**. - Specifically, the **trapezium** and **scaphoid** ossification centers are typically visible by 5-6 years, and the **distal radial epiphysis** has started to ossify but the **distal ulna epiphysis** is not yet visible, which is characteristic of the 6-year-old child. *2 years* - At 2 years of age, fewer **carpal bones** would be ossified, typically only the capitate and hamate, and possibly the triquetrum. - The **epiphyses** of the distal radius and ulna and many of the phalanges and metacarpals would be less developed or not yet visible. *8 years* - By 8 years, the **distal ulna epiphysis** would typically be visible, and the **trapezoid** would also be ossified, which is not clearly evident yet in this image. - The carpal bones present are consistent with a younger age than 8 years. *9 years* - At 9 years, all **carpal ossification centers** (capitate, hamate, triquetrum, lunate, scaphoid, trapezium, trapezoid, and pisiform) would generally be present, with the pisiform appearing around 9-12 years. - The image lacks the full complement of carpal bones consistently seen at 9 years, especially the **pisiform** and a distinctly visible **trapezoid**.

Question 1

When a lumbar puncture is performed to sample cerebrospinal fluid, which of the following external landmarks is the most reliable to determine the position of the L4 vertebral spine?

Accepted Answer

The iliac crests

Answer

The lowest pair of ribs bilaterally

Answer

The inferior angles of the scapulae

Answer

The posterior superior iliac spines

Question 2

Number of carpal bones seen in a radiograph of an infant is:

Accepted Answer

2

Answer

5

Answer

3

Answer

0

Question 3

Lymph nodes of which area are not easily palpable?

Accepted Answer

Abdomen

Answer

Neck

Answer

Groin

Answer

Axilla

Question 4

The ring is denoting the location of?

Accepted Answer

Tricuspid valve

Answer

Pulmonary valve

Answer

Mitral valve

Answer

Aortic valve

Question 5

The following radiograph shows:

Accepted Answer

Gemination in 22

Answer

Fusion in 22

Answer

Concrescence in 22

Answer

Dilaceration in 21

Question 6

The landmark shown here is

Accepted Answer

Tuffier’s line

Answer

Nelaton's line

Answer

Transpyloric plane

Answer

Shenton's line

Question 7

Which of the following represents the surface marking of aortic valve?

Accepted Answer

Sternal end of left 3rd costal cartilage

Answer

Sternal end of right 3rd costal cartilage

Answer

Besides the sternum in the right 3rd intercostal space

Answer

Besides sternum in right 2nd intercostal space

Question 8

In an ultrasound of the abdomen, which structure is best seen posterior to the stomach?

Accepted Answer

Pancreas

Answer

Gallbladder

Answer

Spleen

Answer

Liver

Question 9

The marked area in the image is supplied by which dermatome?

Accepted Answer

T10

Answer

T8

Answer

T9

Answer

T11

Question 10

In the following X-ray of the wrist, what is the exact age of the child?

Accepted Answer

6 years

Answer

2 years

Answer

8 years

Answer

9 years

Surface and Radiological Anatomy — MCQs

Surface and Radiological Anatomy — MCQs

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