In the
lateral ventricles, the tela choroidea–a double-layered fold of
pia mater and
ependyma, produces the
choroid fissure (sometimes also called the choroidal fissure but this is different from the
choroidal fissure of the optic stalk). The choroid fissure is C-shaped, runs between the
fornix and the
thalamus in the body of the ventricle, and between the
stria terminalis and
hippocampal fimbria in the
inferior horn, and is the location of the attachment of the margins of the
choroid plexus. In the choroid fissure of the lateral ventricles, the tela choroidea is a lateral extension of the tela choroidea from the
third ventricle. In the
third ventricle, the tela choroidea forms the roof of the ventricle. Two vascular fringes from the lower fold invaginate the roof and form the choroid plexus. is a double layer of pia mater and ependyma, between the
cerebellum and the lower part of the roof of the fourth ventricle. The two layers are continuous with each other in front, and are mostly adherent throughout. The anterior layer of the fold, contains vascular fringes which make up the choroid plexus.
Blood supply 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 arteries carrying blood into the choroid plexuses are: • the
anterior choroidal artery (branch from the internal carotid). • the
posterior choroidal artery (branch from the posterior cerebral artery).
Medial posterior choroidal branches run forward beneath the splenium of the corpus callosum, and supply the tela chorioidea of the third ventricle and the choroid plexus. ==See also==