Which of the following cavities contains the mediastinum?

Correct option is B

The mediastinum is a central compartment within the thoracic cavity that houses vital structures such as the heart, trachea, esophagus, major blood vessels, and thymus. It lies between the two lungs and extends from the sternum to the vertebral column. The mediastinum is further divided into superior and inferior sections, with the inferior mediastinum containing the pericardial cavity, which encloses the heart.
Explanation of each option:
· (a) Abdominal cavity – Incorrect. The abdominal cavity is located below the diaphragm and contains digestive organs such as the stomach, liver, intestines, pancreas, and kidneys. It does not include the mediastinum, which is located in the thoracic cavity.
· (b) Thoracic cavity – Correct answer. The thoracic cavity is the space within the chest that contains the lungs, heart, and mediastinum. The mediastinum separates the two pleural cavities that house the lungs.
· (c) Pelvic cavity – Incorrect. The pelvic cavity is located below the abdominal cavity and houses the bladder, reproductive organs, and portions of the intestines. It has no connection with the mediastinum, which is in the thoracic region.
· (d) Cranial cavity – Incorrect. The cranial cavity encloses the brain and other structures such as the meninges, cerebrospinal fluid, and cranial nerves. The mediastinum is in the thoracic region, far from the cranial cavity.