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Medial posterior choroidal branches: run forward beneath the splenium of the corpus callosum, and supply the tela choroidea of the third ventricle and the choroid plexus. Lateral posterior choroidal branches: small branches to the cerebral peduncle, fornix, thalamus, caudate nucleus, and choroid plexus of the lateral ventricle. [1]
Occlusions of the branches of the PCA that supply the thalamus can result in central post-stroke pain and lesions to the subthalamic branches can produce “a wide variety of deficits”. [1] Left posterior cerebral artery syndrome presents alexia without agraphia; the lesion is in the splenium of the corpus callosum.
The end part of the corpus callosum, towards the cerebellum, is called the splenium. This is the thickest part, and overlaps the tela choroidea of the third ventricle and the midbrain, and ends in a thick, convex, free border. Splenium translates as "bandage" in Greek. The trunk of the corpus callosum lies between the splenium and the genu.
An example is commissural disconnect in adults which usually results from surgical intervention, tumor, or interruption of the blood supply to the corpus callosum or the immediately adjacent structures. Callosal disconnection syndrome is characterized by left ideomotor apraxia and left-hand agraphia and/or tactile anomia, and is relatively rare.
Pure alexia almost always involves an infarct to the left posterior cerebral artery (which perfuses the splenium of the corpus callosum and left visual cortex, among other things). The resulting deficit will be pure alexia – i.e., the patient can write but cannot read (even what they have just written).
Tela choroidea. The blood supply of these plexuses is from the posterior inferior cerebellar artery.The lateral ventricles also contains the right and left internal cerebral veins (which drain the choroid plexuses) at its roof (the two veins unite to form the great cerebral vein).
The two superior colliculi are situated inferior/caudal to the pineal gland and the splenium of corpus callosum. They are overlapped by the pulvinar of the thalamus, and a medial geniculate nucleus of the thalamus is situated lateral to either superior colliculus. [ 9 ]
The corpus callosum is essential to the communication between the two hemispheres. [2] A recent study of individuals with agenesis of the corpus callosum suggests that the corpus callosum plays a vital role in problem solving strategies, verbal processing speed, and executive performance. Specifically, the absence of a fully developed corpus ...