Which of the following is a part of a dorsal cavity?

Appeared in: MP NHM CHO-2024 (Shift-1)

Explanation

The human body is divided into two major cavities: the dorsal (posterior) and ventral (anterior) cavities.
The dorsal cavity protects the central nervous system.
The dorsal cavity is subdivided into two parts: the cranial cavity (containing the brain) and the spinal or vertebral cavity (containing the spinal cord).
Therefore, the spinal cavity is a part of the dorsal cavity.

Option A: The abdominal cavity is a major subdivision of the ventral cavity, not the dorsal cavity. It contains most of the digestive organs.
Option B: The pelvic cavity is the inferior portion of the abdominopelvic cavity, which is part of the larger ventral cavity. It contains the reproductive organs, bladder, and rectum.
Option C: The thoracic cavity is the superior subdivision of the ventral cavity, enclosed by the rib cage. It contains the heart and lungs.

Visual 1: Diagram: A full-body illustration showing the major body cavities, clearly labeling the dorsal (cranial and spinal) and ventral (thoracic and abdominopelvic) cavities and their respective contents. This helps in visualizing the spatial relationships.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of Human Body Cavities as background academic context rather than a clinical decision trigger.
Understanding the body cavities is fundamental for clinical assessment, diagnosis, and treatment. For example, inflammation within the abdominal cavity is peritonitis, while in the thoracic cavity, it could be pleurisy or pericarditis.
Procedures like lumbar puncture (spinal tap) directly involve accessing the spinal cavity to obtain cerebrospinal fluid for diagnostic purposes.
Surgical procedures are often described based on the cavity being entered (e.g., thoracotomy, laparotomy). Knowledge of these cavities and their contents is crucial for surgeons and nurses to anticipate potential complications.

How to Approach the Question

First, identify the key term in the question: 'dorsal cavity'.
Recall the two primary body cavities: dorsal (posterior/back) and ventral (anterior/front).
Remember the subdivisions of the dorsal cavity: the cranial cavity (for the brain) and the spinal/vertebral cavity (for the spinal cord).
Evaluate each option. The abdominal, pelvic, and thoracic cavities are all subdivisions of the ventral cavity.
Select the option that is a known subdivision of the dorsal cavity, which is the spinal cavity.

Concept Tested & Keywords

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Practise the full MP NHM CHO-2024 (Shift-1)

Attempt every question from this paper in a timed mock, then review the full solution for each one.