The Opisthion is located at which landmark?

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Prepare for the OMM 6 Cranial Evaluation and Treatment Test. Use flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

The Opisthion is located at which landmark?

Explanation:
The Opisthion is the midpoint of the posterior border of the foramen magnum. This landmark sits along the back edge of the large opening at the base of the skull through which the spinal cord passes, and it serves as the posterior counterpart to the basion, which is the midpoint of the anterior border of the foramen magnum. The other choices point to different structures entirely—the anterior border is the basion; the lateral edge of the temporal bone and the superior nasal concha are not related landmarks on the foramen magnum. So, the correct description is the midpoint of the posterior border of the foramen magnum.

The Opisthion is the midpoint of the posterior border of the foramen magnum. This landmark sits along the back edge of the large opening at the base of the skull through which the spinal cord passes, and it serves as the posterior counterpart to the basion, which is the midpoint of the anterior border of the foramen magnum. The other choices point to different structures entirely—the anterior border is the basion; the lateral edge of the temporal bone and the superior nasal concha are not related landmarks on the foramen magnum. So, the correct description is the midpoint of the posterior border of the foramen magnum.

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