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Ch. 1 An Introduction to Anatomy and Physiology
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
All textbooksMartini, Nath, Bartholomew 11th EditionCh. 1 An Introduction to Anatomy and PhysiologyProblem 23
Chapter 1, Problem 23

The mediastinum is the region between the
(a) Lungs and heart
(b) Two pleural cavities
(c) Chest and abdomen
(d) Heart and pericardium

Verified step by step guidance
1
Understand the anatomical location of the mediastinum. It is a central compartment within the thoracic cavity.
Recall that the thoracic cavity is divided into two pleural cavities, each containing a lung, and the mediastinum lies between these two cavities.
Identify the structures contained within the mediastinum, which include the heart, trachea, esophagus, and major blood vessels.
Analyze each option: (a) Lungs and heart - the heart is inside the mediastinum, so this is not the space between lungs and heart; (b) Two pleural cavities - the mediastinum lies between these cavities; (c) Chest and abdomen - these are separated by the diaphragm, not the mediastinum; (d) Heart and pericardium - the pericardium surrounds the heart, so no space between them.
Conclude that the mediastinum is the region between the two pleural cavities, making option (b) the correct description.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Mediastinum Anatomy

The mediastinum is the central compartment of the thoracic cavity, located between the two pleural cavities that contain the lungs. It houses vital structures such as the heart, trachea, esophagus, and major blood vessels.
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Pleural Cavities

Pleural cavities are the two separate spaces within the thorax that each surround a lung. They are lined by the pleura, a double-layered membrane, and are separated by the mediastinum.
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Pressure in the Lungs and Pleural Cavity Example 2

Thoracic Cavity Boundaries

The thoracic cavity is bounded superiorly by the thoracic inlet, inferiorly by the diaphragm, and laterally by the ribs and muscles. Understanding these boundaries helps define the location of the mediastinum relative to other structures.
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Related Practice
Textbook Question

A plane through the body that passes perpendicular to the long axis of the body and divides the body into a superior and an inferior section is a

(a) Sagittal section,

(b) Transverse section,

(c) Coronal section,

(d) Frontal section.

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Textbook Question

(b) Define physiology.

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Textbook Question

(a) Define anatomy.

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Textbook Question

Which body cavity would enclose each of the following organs?

(a) Heart

(b) Small intestine, large intestine

(c) Lung

(d) Kidneys

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Textbook Question

The two major body cavities of the trunk are the

(a) Pleural cavity and pericardial cavity

(b) Pericardial cavity and peritoneal cavity

(c) Pleural cavity and peritoneal cavity

(d) Thoracic cavity and abdominopelvic cavity

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Textbook Question

The study of the structure of tissues is called (a) gross anatomy, (b) cytology, (c) histology, (d) organology.

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