A space called the is found between the two pleural cavities?

ESIC Nursing Officer 2016 (shift-1)

Applied Anatomy

Easy

Appeared in: ESIC Nursing Officer 2016 (shift-1)

Explanation

The mediastinum is the anatomical term for the central compartment of the thoracic cavity, located between the two lungs (pleural cavities).
As shown in the diagram, it contains the heart, great blood vessels (aorta, vena cava), esophagus, and trachea.
It is a mobile, dynamic space, not a rigid structure, which allows for the movement of the heart and lungs during breathing and changes in body position.
The term itself comes from Latin, meaning 'middle septum'.

Option A: Serosa, or a serous membrane, is a type of tissue that lines body cavities. The pleura itself is a serosa, but 'serosa' is not the name of the space between the pleural cavities.
Option B: Parietal refers to the outer layer of a serous membrane. The parietal pleura lines the chest wall. It is a component of the pleural sac, not the space between the two sacs.
Option C: The soleus is a major muscle in the posterior compartment of the lower leg (calf). It is completely unrelated to the anatomy of the thorax.

Visual 1: Diagram - A sagittal and transverse view of the thorax, clearly labeling the superior, anterior, middle, and posterior subdivisions of the mediastinum and their contents.
Visual 2: Illustration - A depiction of a mediastinal shift in a patient with a tension pneumothorax, showing the trachea deviated away from the affected side and compression of the contralateral lung and heart.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Thoracic Cavity as background academic context rather than a clinical decision trigger.
Nurses must be able to recognize signs of mediastinal shift, a life-threatening emergency. Key signs include tracheal deviation, severe dyspnea, hypotension, and jugular venous distention.
Understanding the contents of the mediastinum is vital for interpreting chest X-rays and CT scans, where abnormalities like mediastinal widening can indicate aortic dissection, tumors (e.g., lymphoma), or hemorrhage.
What if? If a patient with a chest injury develops sudden hypotension, tachycardia, and their trachea is deviated to the left, the nurse should suspect a tension pneumothorax on the right side causing a mediastinal shift. The priority action is to call for immediate medical assistance for emergency needle decompression.

How to Approach the Question

First, identify the key anatomical terms in the question: 'space', 'between', and 'two pleural cavities'.
Reference the provided image, which visually depicts the thoracic cavity. Locate the two lungs and the central area between them.
Evaluate each option based on your anatomical knowledge and the visual aid.
Eliminate options that are clearly incorrect or irrelevant. The 'Soleus' muscle is in the leg, making it an easy first elimination.
Differentiate between a space and a type of tissue or layer. 'Serosa' is a tissue type and 'Parietal' is a layer, whereas the question asks for a 'space'.
Select the term that accurately names the central thoracic compartment shown in the image and described by the question.

Concept Tested & Keywords

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