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Anterior choroidal artery: want to learn more about it?

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Anterior choroidal artery

Anterior choroidal artery (Arteria choroidea anterior)

The anterior choroidal artery is the preterminal branch of the communicating segment (C7) of the internal carotid artery. It supplies several subcortical structures (limbic system, basal ganglia, diencephalon), midbrain, temporal lobe and visual pathway. Therefore, these structures will be the main ones affected during a stroke of the anterior choroidal artery.

The artery is located within the parahippocampal gyrus, deep within the brain. It gives off approximately eight minor, perforating branches.

This article will discuss the anatomy and function of the anterior choroidal artery.

Key facts about the anterior choroidal artery
Origin Communicating segment (C7) of internal carotid artery
Branches Perforating branches
Supply Limbic system: amygdala, hippocampus, basal ganglia (globus pallidus, substantia nigra, caudate nucleus), fimbria of fornix
Diencephalon: hypothalamus, lateral geniculate body of thalamus
Midbrain: red nucleus, crus cerebri of midbrain
Visual pathway: optic tract, optic radiation
Others: tela choroidea, posterior limb of the internal capsule

Course

The anterior choroidal artery (AChA) occupies the semi-anular sulcus of the parahippocampal gyrus. It originates from the posterolateral aspect of the internal carotid artery, between the posterior communicating branch (PCOM) and the terminal ICA bifurcation.

The anterior choroidal artery is divided into two segments: cisternal and intraventricular. The proximal cisternal segment initially follows a posterior course. It travels along the medial aspect of the uncus of parahippocampal gyrus and lateral to the optic tract, over which it eventually crosses. The segment continues to the crus cerebri of the cerebral peduncle. From here, its course deviates from posterior to lateral. The cisternal segment then travels around the cerebral peduncle, recrosses the optic tract and reaches the lateral geniculate body of the thalamus. From here, it courses superiorly through the choroid fissure to reach the temporal horn of the lateral ventricle.

The intraventricular segment continues within the lateral ventricle, accompanying the choroid plexus. At this point, it receives the lateral posterior choroidal branch of posterior cerebral artery. The segment then continues superiorly around the thalamus, until the interventricular foramen (of Monro). The anterior choroidal artery finishes at this point by anastomosing with the medial posterior choroidal branch of posterior cerebral artery.

Branches and supply

The anterior choroidal artery gives several off minor, perforating branches:

  • The cisternal segment provides eight such branches. They supply the amygdala, hippocampus, globus pallidus, substantia nigra, caudate nucleus, hypothalamus, red nucleus, tela choroidea, posterior limb of the internal capsule, optic tract, crus cerebri of the midbrain and fimbria of the fornix.
  • The intraventricular segment supplies the optic tract and the lateral geniculate body of the thalamus.

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Anterior choroidal artery: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

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