Ventricles + Chorid Plexus Flashcards
What is the choroid plexus?
The choroid plexus consist of convolutions of blood vessels protruding into the ventricles from specific parts of the wall.
The choroidal plexus consist of pia mater and choroid lamina epithelialis (plexus epithelium). The function of the choroid plexus is to produce CSF into the ventricles.
What is the plexus epithelium (choroid lamina epithelialis)?
The layer that once was a thin layer of hemispheric wall during development, but later turns into this epithelium. (Transformed hemispheric wall)
It forms the choroid plexus together with pia mater.
What is the choroid fissure?
The choroid plexus consist of invaginations into the ventricles. The choroid plexus remains attached to the external pia mater through a narrow channel, the choroid fissure. When the choroid plexus is removed, the thinned parts of the hemispheric wall tear away at this location.
What is the choroid taenia?
The line of attachment of the choroid lamina epithelialis.
E.g. taenia fornicis and taenia choroidea
Where can you find the choroid plexus?
In the roof of the 3rd and 4th ventricles, and next to the central part and inferior horns of the lateral ventricles. The plexus in the lateral ventricle is the largest and most important.
What is the tela choroidea?
It is a duplication of the leptomeninges that forms during development. It is a connective tissue plate spanning between the telencephalic hemispheres and the diencephalon.
At its lateral margins, the pia mater forms the vascular convolutions for the choroid plexus of the lateral ventricles. In the middle, the tela covers the roof of the third ventricle (tela choroidea of the third ventricle). In this region, two rows of convoluted blood vessels protrude into the lumen of the third ventricle and form the choroid plexus of the third ventricle.
What are the borders of the fourth ventricle?
Roof: superior medullary velum and inferior medullary velum, the nodule of the cerebellum, the choroid lamina epithelialis of the fourth ventricle.
Floor: rhomboid fossa
