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The tela choroidea (or tela chorioidea) is a region of meninges pia mater that adheres to the underlying ependyma, and gives rise to the choroid plexus in each of the brain’s four ventricles. (2025). 9780781790697, Lippincott William & Wilkins. ISBN 9780781790697 (2025). 9780443065835, Churchill Livingstone. ISBN 9780443065835 Tela is Latin for woven and is used to describe a web-like membrane or layer. (2025). 9781416062578, Saunders/Elsevier. ISBN 9781416062578 The tela choroidea is a very thin part of the loose connective tissue of pia mater overlying and closely adhering to the ependyma. It has a rich blood supply. The ependyma and capillary pia mater – the tela choroidea, form regions of minute projections known as a choroid plexus that projects into each ventricle. The choroid plexus produces most of the cerebrospinal fluid of the central nervous system that circulates through the ventricles of the brain, the central canal of the spinal cord, and the subarachnoid space. The tela choroidea in the ventricles forms from different parts of the roof plate in the development of the embryo.
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.
The tela choroidea of the fourth ventricle (also known as the triangular lamella) (2025). 9781416062578, Saunders/Elsevier. ISBN 9781416062578 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. The anterior layer is continuous inferiorly with the pia mater on the inferior cerebellar peduncles and the closed part of the medulla oblongata. The posterior layer covers the antero-inferior surface of the cerebellum.
Cilia on the move to circulate the cerebrospinal fluid. These cilia are unusually multiple primary cilia.
The arteries carrying blood into the choroid plexuses are:
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.
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