Page 1 of 1: Access to this artery

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An angiographic study of the distal part of the circle of Willis requires access to the vertebral artery. Access to this artery can be obtained via the

Options:

A. anterior triangle of the neck.

B. muscular triangle of the neck.

C. posterior triangle of the neck.

D. submental triangle.

E. suboccipital triangle.

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The correct answer is E.

The suboccipital triangle lies in the neck at the base of the skull. The suboccipital triangle is bounded by the inferior oblique, rectus major, and superior oblique muscles. The vertebral artery can be found within the suboccipital triangle, lying on the posterior arch of the atlas, lateral to the midline, typically at about the level of the lower portion of the ear lobe. Care should be taken in accessing the vessel, since the first cervical nerve lies between the vertebral artery and the posterior arch of the atlas.

The anterior triangle of the neck (choice A) is in the anterior neck, and is bounded by the neck midline, the mandible, and the sternocleidomastoid muscle. The anterior triangle of the neck is subdivided into the muscular, carotid, submandibular, and submental triangles.

The small muscular triangle (choice B) lies between the superior belly of the omohyoid and the sternohyoid muscle.

The posterior triangle of the neck (choice C) is on the side of the neck, and is bounded by the
sternocleidomastoid muscle, trapezius, and the middle third of the clavicle.

The submental triangle (choice D), also called the suprahyoid triangle, is found below the lower jaw, and is bounded by the hyoid bone and anterior bellies of the digastric muscles.

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