Question
Which of the following structures passes through the foramen magnum?
| A. |
Internal jugular vein
|
| B. |
Vertebral artery
|
| C. |
Internal carotid artery
|
| D. |
Middle meningeal artery
|
Show Answer
|
Correct Answer » B
Explanation
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|
The foramen magnum is the largest opening in the base of the skull, located in the occipital bone. It connects the cranial cavity with the vertebral canal.
Structures Passing Through the Foramen Magnum
- Medulla oblongata (continuing as the spinal cord)
- Vertebral arteries
- Anterior spinal artery
- Posterior spinal arteries
- Spinal root of accessory nerve (CN XI)
- Meninges
- Venous plexuses
- Tectorial membrane and associated ligaments
Reason to rule out other options:
A. Internal jugular vein
The internal jugular vein exits the skull through the jugular foramen.
C. Internal carotid artery
The internal carotid artery enters the cranial cavity through the carotid canal.
D. Middle meningeal artery
The middle meningeal artery enters the cranial cavity through the foramen spinosum.
