Anterior choroidal artery

The anterior choroidal artery (AChA) supplies several crucial anatomical structures of the brain important for vision and motor control. Identification of AChA is important because of its strategic and extensive area of supply as well as large variations in the territorial distribution.

The AChA originates from the posterior wall of the ICA between the origin of the posterior communicating artery (PCOM) (which is 2-5 mm proximal to the AChA) and the internal carotid termination (which is 2-5 mm distal to the AChA). It measures ~1 mm in diameter.

The AChA is located lateral to the optic tract, it then curves medially to its inferomedial surface, to curve again laterally to run along the lateral aspect of the optic tract and circumvents the cerebral peduncles to reach the lateral geniculate body. It traverses in the posterolateral direction above the uncus to enter the choroidal fissure.

The AChA can be divided into two segments:

  • cisternal segment: extends from its origin until the choroidal fissure; measures ~2.5 cm (range 1.5-3.5 cm) in length
  • intraventricular segment: after entering the choroidal fissure
  • cisternal segment
  • intraventricular segment
    • choroid plexus of the anterior part of the temporal horns of the lateral ventricles
Anatomy: Brain
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Article information

rID: 28192
Section: Anatomy
Tag: pm, cases, cases
Synonyms or Alternate Spellings:
  • AChA
  • Anterior choroidal artery (AChA)

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Cases and figures

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    Figure 1: cerebral vascular territories
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    Figure 2: MRA of the choroidal arteries
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