Quiz: Thoracic Mediastinum and Bronchial Anatomy — 12 Fragen

1. Which sensation is the visceral pleura primarily able to detect?

A. Temperature

B. Stretch

C. Pain

D. Pressure

Answer: (B)

Erklärung

Visceral pleura is supplied by visceral afferent fibers and is sensitive mainly to stretch. In contrast, the parietal pleura is sensitive to pain, temperature, touch, and pressure.

2. What plane separates the superior mediastinum from the inferior mediastinum?

A. A plane through the costal margin and diaphragm

B. An imaginary plane from the sternal angle to the T4 vertebral level

C. A horizontal plane through the xiphoid process

D. A plane from the clavicle to the first rib

Answer: (B)

Erklärung

The mediastinum is divided into superior and inferior parts by a plane running from the sternal angle to the lower border of T4. The other planes do not describe this division.

3. Which nerves supply the sensory innervation of the parietal pleura?

A. The intercostal veins and azygos vein

B. The pulmonary plexus and recurrent laryngeal nerves

C. Intercostal nerves and the phrenic nerve

D. The vagus nerve and sympathetic trunks

Answer: (C)

Erklärung

The parietal pleura receives somatic afferent innervation from the intercostal nerves and the phrenic nerve. The visceral pleura, by contrast, carries afferents with autonomic nerves from the pulmonary plexus.

4. Which structure lies in the middle mediastinum?

A. The esophagus and thoracic duct

B. The aorta and azygos vein

C. The thymus and great veins

D. The pericardium and heart

Answer: (D)

Erklärung

The middle mediastinum contains the pericardium and heart. The posterior mediastinum contains the esophagus and thoracic duct, while the anterior mediastinum lies between the sternum and pericardium.

5. What supports the trachea and keeps its lumen open?

A. Hyaline cartilage rings joined posteriorly by the trachealis muscle

B. Fibrocartilage rings joined by the diaphragm

C. Bone rings joined by the esophageal wall

D. Elastic cartilage plates joined anteriorly by smooth muscle

Answer: (A)

Erklärung

The trachea is supported by hyaline cartilage rings, with a posterior gap bridged by the trachealis muscle. This arrangement maintains openness while allowing some flexibility.

6. Which region of the parietal pleura lines the inner rib surfaces and intercostal spaces?

A. Mediastinal pleura

B. Diaphragmatic pleura

C. Costal pleura

D. Cervical pleura

Answer: (C)

Erklärung

The costal pleura lines the inner surfaces of the ribs, costal cartilages, intercostal spaces, sides of vertebral bodies, and the back of the sternum. Cervical pleura extends into the neck instead.

7. Which description best matches the right principal bronchus?

A. Equal in length but more oblique than the left

B. Longer and more horizontal, with no lobar branches

C. Wider, shorter, and more vertical than the left

D. Narrower, longer, and more horizontal than the left

Answer: (C)

Erklärung

The right principal bronchus is wider, shorter, and more vertical, and it gives rise to the superior, middle, and inferior lobar bronchi. The left principal bronchus is the narrower, longer, more horizontal one.

8. Which pair correctly names the two layers of each pleural membrane?

A. Mediastinal pleura and cervical pleura

B. Fibrous pleura and serous pleura

C. Parietal pleura and visceral pleura

D. Costal pleura and diaphragmatic pleura

Answer: (C)

Erklärung

Each pleural membrane has a parietal layer and a visceral layer. The regional names such as costal and mediastinal apply only to parts of the parietal pleura.

9. Which set of structures is contained within the mediastinum?

A. The lungs, pleural recesses, and diaphragm

B. The thymus, scapulae, and abdominal aorta

C. The heart, trachea, esophagus, and thoracic duct

D. The ribs, intercostal muscles, and sternum

Answer: (C)

Erklärung

The mediastinum contains the heart and large vessels, trachea and esophagus, thoracic duct and lymph nodes, and several major nerves. The lungs are in the pleural cavities, not the mediastinum.

10. Where does the trachea begin and where does it end?

A. It begins at the lower border of the cricoid cartilage and ends at the sternal angle

B. It begins at the thyroid cartilage and ends at the diaphragm

C. It begins at the laryngeal inlet and ends behind the heart

D. It begins at the hyoid bone and ends at the tracheal bifurcation in the abdomen

Answer: (A)

Erklärung

The trachea is a continuation of the larynx at the lower border of the cricoid cartilage and ends by dividing into the principal bronchi at the sternal angle. The other options place its start or end at incorrect landmarks.

11. How do the principal bronchi branch after the trachea bifurcates?

A. They branch into pleural recesses and bronchioles

B. They join to form lobar veins and then segmental arteries

C. They divide directly into alveolar sacs

D. They divide dichotomously into terminal bronchioles and then respiratory bronchioles

Answer: (D)

Erklärung

The principal bronchi divide dichotomously into terminal bronchioles and then respiratory bronchioles. The other options describe unrelated or incorrect airway pathways.

12. Which structures form the boundaries of the mediastinum in the thorax?

A. The sternum, pleural cavities, and vertebral column

B. The ribs, diaphragm, and clavicles

C. The sternum, diaphragm, and intercostal spaces

D. The lungs, pericardium, and thoracic inlet

Answer: (A)

Erklärung

The mediastinum is the central thoracic space between the sternum, the two pleural cavities, and the vertebral column. The other options include structures that do not define its boundaries.