CT ARRT Exam Questions & Answers 2026 (11–20)

Question 1

The superior sagittal sinus drains into which venous structure at the internal occipital protuberance?

TheoryPractice · Accepted Answer

Confluence of sinuses. The superior sagittal sinus drains posteriorly to join the confluence of sinuses (torcular Herophili) at the internal occipital protuberance, where multiple dural sinuses meet.

Question 2

Which artery supplies the medial surface of the frontal and parietal lobes?

TheoryPractice · Accepted Answer

Anterior cerebral artery. The anterior cerebral artery (ACA) curves over the corpus callosum and supplies the medial frontal and parietal lobes, including the supplementary motor area and lower limb cortex.

Question 3

Which artery is most commonly implicated in posterior communicating artery aneurysm causing CN III palsy?

TheoryPractice · Accepted Answer

Posterior communicating artery. Aneurysms at the junction of the internal carotid artery and the posterior communicating artery (PCom) are the most common cause of a painful CN III (oculomotor) palsy due to direct nerve compression.

Question 4

The foramen spinosum transmits which vessel into the middle cranial fossa?

TheoryPractice · Accepted Answer

Middle meningeal artery. The middle meningeal artery, a branch of the maxillary artery, enters the skull through the foramen spinosum to supply the dura and periosteum of the middle cranial fossa.

Question 5

The jugular foramen transmits which combination of structures?

TheoryPractice · Accepted Answer

CN IX, X, XI and internal jugular vein. The jugular foramen transmits CN IX (glossopharyngeal), CN X (vagus), CN XI (accessory), and the internal jugular vein (continuation of the sigmoid sinus).

Question 6

Which foramen in the greater wing of the sphenoid transmits the mandibular division of CN V (V3)?

TheoryPractice · Accepted Answer

Foramen ovale. The foramen ovale transmits V3 (mandibular division of the trigeminal nerve) along with the lesser petrosal nerve and accessory meningeal artery.

Question 7

Which structure forms the posterior boundary of the orbit and allows passage of the optic nerve?

TheoryPractice · Accepted Answer

Optic canal. The optic canal, located in the lesser wing of the sphenoid, transmits the optic nerve (CN II) and ophthalmic artery from the middle cranial fossa into the orbit.

Question 8

Which paranasal sinus is most commonly involved in acute sinusitis due to its dependent position and narrow ostium?

TheoryPractice · Accepted Answer

Maxillary sinus. The maxillary sinus has its ostium high on the medial wall (not at the floor), making dependent drainage difficult and predisposing it to fluid accumulation and infection.

Question 9

The ostiomeatal complex (OMC), the key drainage pathway for the anterior sinuses, is best evaluated on which CT plane?

TheoryPractice · Accepted Answer

Coronal. Coronal CT is the standard plane for evaluating the ostiomeatal complex because it displays the maxillary ostia, ethmoid infundibulum, uncinate process, and middle meatus in a single plane.

Question 10

On high-resolution axial CT of the temporal bone, the cochlea normally shows approximately how many turns?

TheoryPractice · Accepted Answer

2.5 turns. The human cochlea makes approximately 2.5 turns from its base to its apex, a consistent anatomic feature used to assess cochlear development on CT.

CT ARRT Exam Questions & Answers 2026 (11–20)

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