Thorax Practice Questions

Q: Which are the segments of the upper lobe of the right lung?

Apical, anterior, posterior. ***Apical, anterior, posterior*** - The **right upper lobe** is consistently divided into three bronchopulmonary segments: **apical**, **anterior**, and **posterior** [1]. - These segments are named according to their anatomical position and the branching of the **tertiary bronchi** that supply them [1]. *Anterior, posterior, medial* - While **anterior** and **posterior** segments exist, the "medial" segment is not a standard division of the right upper lobe. - The term "medial" is typically associated with the **middle lobe** of the right lung (medial and lateral segments) [1]. *Lateral, medial, superior* - The segments **lateral** and **medial** are characteristic of the **right middle lobe** [1]. - "Superior" is a general directional term and not a specific segment name within the upper lobe in this context, although the apical segment is superiorly located. *Basal, medial, lateral* - **Basal** segments are found in the **lower lobes** of the lungs (e.g., anterior basal, medial basal, posterior basal, lateral basal). - **Medial** and **lateral** segments are typical of the **right middle lobe**, not the upper lobe [1].

Q: Which of the following is the MAJOR tributary of the coronary sinus?

Great cardiac vein. ***Great cardiac vein*** - The **great cardiac vein** is the largest and most significant tributary, draining areas supplied by the **left main coronary artery** and its branches. - It runs in the **anterior interventricular groove**, accompanying the anterior interventricular artery, and then curves around the left side of the heart to empty into the coronary sinus. *Anterior cardiac vein* - The **anterior cardiac veins** typically drain directly into the **right atrium**, bypassing the coronary sinus [1]. - They primarily drain the anterior surface of the **right ventricle**. *Thebesian vein* - The **Thebesian veins** (venae cordis minimae) are small veins that open directly into the **chambers of the heart**, not the coronary sinus. - They are responsible for a small amount of **physiological shunt** of deoxygenated blood into the left heart chambers. *Oblique vein of Marshall* - The **oblique vein of Marshall** (oblique vein of the left atrium) is a small vein originating from the posterior wall of the left atrium. - It is a **remnant of the left superior vena cava** and empties into the left extremity of the coronary sinus, but it is not considered the major tributary in terms of blood flow volume.

Q: Azygos vein drains into:

Superior vena cava. ***Superior vena cava*** - The **azygos vein** is a major venous channel that drains the walls of the thorax and abdomen, emptying directly into the **superior vena cava (SVC)**. [1] - This connection is crucial for venous return from the posterior thoracic wall, pericardium, and bronchi, especially bypassing the inferior vena cava if it's obstructed. [1] *Right subcostal vein* - The right subcostal vein is a tributary that helps form the **azygos vein**; it does not receive drainage from the azygos vein. - It contributes to the initial formation of the azygos system, not its termination. *Brachiocephalic* - The **brachiocephalic veins** are formed by the union of the internal jugular and subclavian veins, and they merge to form the **superior vena cava**. - The azygos vein drains into the superior vena cava, not directly into the brachiocephalic veins. *Right ascending lumbar vein* - The **right ascending lumbar vein** is a major tributary that contributes to the formation of the **azygos vein** in the lumbar region. - It drains into the azygos system, illustrating its origin rather than its termination.

Q: Esophagus is present in which mediastinum?

Posterior. ***Posterior*** - The **esophagus** is primarily located in the **posterior mediastinum**, where the bulk of its length (from T4/T5 to T10) traverses [2]. - It lies **posterior** to the **trachea** and **heart**, anterior to the vertebral column [2]. - For examination purposes, the esophagus is considered a **key structure of the posterior mediastinum** [2]. - Note: The uppermost part (cervical and upper thoracic) does pass through the superior mediastinum, but the majority lies in the posterior compartment. *Anterior* - The **anterior mediastinum** is a small space located between the **sternum** and the pericardium. - It primarily contains **connective tissue**, remnants of the thymus, lymph nodes, and the internal thoracic vessels [1]. - The esophagus does not traverse this compartment. *Middle* - The **middle mediastinum** is centrally located and prominently contains the **heart** and the roots of the great vessels [1]. - It also houses the **pericardium**, the main bronchi, and the phrenic nerves [1]. - The esophagus passes **posterior** to this compartment, not through it. *Superior* - The **superior mediastinum** extends from the thoracic inlet to the level of the sternal angle (T4/T5). - It contains large vessels like the **aortic arch** and its branches, the SVC, trachea, and thymus [1]. - While the **uppermost part of the thoracic esophagus** does pass through the superior mediastinum, this represents only a small portion of its total length.

Q: Upper two posterior intercostal arteries arise from ?

Superior intercostal artery. ***Superior intercostal artery*** - The **superior intercostal artery** is a branch of the **costocervical trunk**, which itself arises from the subclavian artery. - It supplies the **first two posterior intercostal spaces**, hence the "upper two" mentioned in the question. *Aorta* - The **descending thoracic aorta** directly supplies the posterior intercostal arteries from the **3rd to the 11th intercostal spaces**. - It does not, however, supply the first two posterior intercostal arteries. *Internal mammary artery* - The **internal mammary artery** (also known as the internal thoracic artery) supplies the **anterior intercostal arteries** [1]. - It arises from the **subclavian artery** [1] but is not involved in supplying the posterior intercostal spaces. *Bronchial artery* - **Bronchial arteries** primarily supply the **lungs and bronchi**, providing oxygenated blood to the lung tissue. - They are not the main source of blood supply for the intercostal spaces.

Q: Which of the following statements is false about the right bronchus?

More horizontal. ***More horizontal*** - The right bronchus is traditionally described as **more vertical** or **more directly in line with the trachea** compared to the left bronchus. - This anatomical orientation makes it more susceptible to the aspiration of foreign bodies. *Shorter* - The **right main bronchus** is indeed shorter than the left main bronchus. - Its length is typically 2-3 cm, while the left main bronchus is about 5 cm long. *Wider* - The **right main bronchus** has a larger diameter than the left main bronchus. - This wider lumen contributes to the ease with which foreign bodies can enter it. *In the line of trachea* - The right main bronchus diverges from the trachea at a **less acute angle** (approximately 25 degrees) compared to the left (approximately 45 degrees). - This makes it appear more as a **direct continuation of the trachea**, facilitating aspiration into the right lung.

Q: Which chamber of the heart forms the posterior surface?

Left Atrium (LA). ***Left Atrium (LA)*** - The **left atrium** forms the posterior surface of the heart, lying in front of the esophagus and thoracic aorta [1]. - Its posterior position makes it susceptible to enlargement, which can compress the **esophagus** and cause dysphagia [1]. *Right Atrium (RA)* - The **right atrium** primarily forms the right border of the heart and receives deoxygenated blood from the systemic circulation. - It lies anteriorly and to the right, behind the sternum and costal cartilages. *Left Ventricle (LV)* - The **left ventricle** forms the apex of the heart and part of the left border. - It is positioned *inferiorly* and *anteriorly*, contributing significantly to the *diaphragmatic surface* of the heart. *Right Ventricle (RV)* - The **right ventricle** forms the majority of the anterior surface of the heart, directly behind the sternum. - It also contributes to the *inferior surface* of the heart, resting on the diaphragm.

Q: Which part of the heart is located in the anterosuperior sternal region?

Right ventricle.. ***Right ventricle*** - The **right ventricle** forms the **most anterior part of the heart**, located directly behind the sternum and costal cartilages [1]. - Its position explains why **sternal precordial leads** (e.g., V1, V2) on an ECG primarily reflect right ventricular activity [1]. *Right atrium and auricle* - While part of the right atrium is anterior, the **right ventricle is significantly more anterior** and occupies the majority of the anterosuperior sternal region [1]. - The **right auricle** is a small, anterior appendage, but the broader chamber occupying this region is the ventricle [1]. *Left atrium* - The **left atrium** is the **most posterior chamber of the heart**, forming the base [1]. - It lies near the esophagus, making it susceptible to compression by an enlarged left atrium. *Left ventricle* - The **left ventricle** forms the **apex of the heart** and is located primarily on the **left and inferior** aspects. - It is not the most anterior structure; the right ventricle is positioned anteriorly to it [1].

Q: Which mediastinal compartment does not contain the esophagus?

Anterior mediastinum. ***Anterior mediastinum*** - The **anterior mediastinum** is the smallest subdivision of the inferior mediastinum, located between the body of the sternum and the pericardium. - It primarily contains **loose connective tissue, lymph nodes, and the thymus remnant** [1]. - The esophagus is **never found** in the anterior mediastinum, making this the most definitive correct answer. *Middle mediastinum* - The **middle mediastinum** contains the pericardium and heart, along with the roots of the great vessels [1]. - The esophagus is **not contained within** the middle mediastinum proper; however, it lies immediately posterior to it in the posterior mediastinum. - Note: While technically the middle mediastinum does not contain the esophagus, the **anterior mediastinum** is the most definitive answer as it is furthest removed from the esophagus. *Posterior mediastinum* - The **posterior mediastinum** is located posterior to the pericardium and diaphragm, and anterior to the thoracic vertebrae. - It **contains the esophagus**, along with the thoracic aorta, azygos vein, hemiazygos vein, and thoracic duct. *Superior mediastinum* - The **superior mediastinum** extends from the thoracic inlet to the level of the sternal angle (T4-T5 level). - The **esophagus traverses** through the superior mediastinum as it descends from the neck towards the abdomen.

Question 1

Which are the segments of the upper lobe of the right lung?

Accepted Answer

Apical, anterior, posterior

Answer

Lateral, medial, superior

Answer

Basal, medial, lateral

Answer

Anterior, posterior, medial

Question 2

Which of the following is the MAJOR tributary of the coronary sinus?

Accepted Answer

Great cardiac vein

Answer

Anterior cardiac vein

Answer

Thebesian vein

Answer

Oblique vein of Marshall

Question 3

Azygos vein drains into:

Accepted Answer

Superior vena cava

Answer

Right subcostal vein

Answer

Right ascending lumbar vein

Answer

Brachiocephalic

Question 4

Which of the following statements about the anatomy of the right ventricle is correct?

Accepted Answer

The crista supraventricularis separates the tricuspid and pulmonary valves, and the apex is trabeculated

Answer

TV & PV Share fibrous continuity

Answer

More prominent trabeculation

Answer

All of the options

Question 5

Esophagus is present in which mediastinum?

Accepted Answer

Posterior

Answer

Answer

Middle

Answer

Superior

Question 6

Upper two posterior intercostal arteries arise from ?

Accepted Answer

Superior intercostal artery

Answer

Internal mammary artery

Answer

Bronchial artery

Answer

Aorta

Question 7

Which of the following statements is false about the right bronchus?

Accepted Answer

More horizontal

Answer

Shorter

Answer

In the line of trachea

Answer

Wider

Question 8

Which chamber of the heart forms the posterior surface?

Accepted Answer

Left Atrium (LA)

Answer

Right Atrium (RA)

Answer

Left Ventricle (LV)

Answer

Right Ventricle (RV)

Question 9

Which part of the heart is located in the anterosuperior sternal region?

Accepted Answer

Right ventricle.

Answer

Right atrium and auricle.

Answer

Left atrium.

Answer

Left ventricle.

Question 10

Which mediastinal compartment does not contain the esophagus?

Accepted Answer

Anterior mediastinum

Answer

Posterior mediastinum

Answer

Middle mediastinum

Answer

Superior mediastinum

Thorax — MCQs

Thorax — MCQs

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