Blood Supply
The superior parts of both the anterior and posterior limbs and the genu of the internal capsule are supplied by the lenticulostriate arteries, which are branches off of the M1 segment of the middle cerebral artery.
The inferior half of the anterior limb is supplied via the recurrent artery of Heubner, which is a branch of the anterior cerebral artery.
The inferior half of the posterior limb is supplied by the anterior choroidal artery, which is a branch of the internal carotid artery.
In summary, the blood supply of the internal capsule is
Anterior limb: lenticulostriate branches of middle cerebral artery (superior half) & recurrent artery of Heubner off of the anterior cerebral artery (inferior half)
Genu: lenticulostriate branches of middle cerebral artery
Posterior limb: lenticulostriate branches of middle cerebral artery (superior half) & anterior choroidal artery off of the internal carotid artery (inferior half)
As in many parts of the body, some degree of variation in the blood supply exists. For example, thalamoperforator arteries, which are branches of the basilar artery, occasionally supply the inferior half of the posterior limb.
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