Tela chorioidea is a structure found in the ventricle

Ventricular system

The ventricular system is a set of structures containing cerebrospinal fluid in the brain. It is continuous with the central canal of the spinal cord.-Components:The system comprises four ventricles:* right and left lateral ventricles* third ventricle...

s of the brain:

Types include:

• Tela chorioidea of the third ventricle
• Tela chorioidea of the fourth ventricle
• Tela chorioidea of the lateral ventricle

Tela chorioidea of the lateral ventricle

It is a double layered fold of pia mater intervening between:

1. the body of the fornix (above).
2. the upper surface of the two thalami and the roof of the 3rd ventricle (below).

It contains the choroid plexus

Choroid plexus

The choroid plexus is a structure in the ventricles of the brain where cerebrospinal fluid is produced...

es which invaginate into:

1. The body of the each lateral ventricle through the choroid fissure
   Choroid fissure
   The choroid is the middle, vascular coat of the eye which resides between the sclera and the retina. Early in development the choroid fissure is the slit observed between the two edges of the eye cup. During development it is through the choroid fissure that the retinal vessels enter the eye and...
   
    (between the fornix and the thalamus).
2. The 3rd ventricle through its ependymal roof.

It also contains the right and left internal cerebral veins

Internal cerebral veins

The internal cerebral veins drain the deep parts of the hemisphere and are two in number; each is formed near the interventricular foramen by the union of the terminal and choroid 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:

1. the anterior choroidal artery
   Anterior choroidal artery
   The anterior choroidal artery originates from the internal carotid artery, though it also rarely arises from the middle cerebral artery.-Structures supplied:The anterior choroidal artery serves many structures in the cerebrum:...
   
    (branch from the internal capsule).
2. the posterior choroidal artery (branch from the posterior cerebral artery).