Choroid plexus

The choroid plexus, and the choroid plexus or plexus chorioides written (plural: the choir plexus [i ] oidei / chorioides ), is a tree-like branched vascular plexus in the cavity system (ventricles ) of the brain. Each of the four ventricles has such a network of veins, also referred to as Zottenwulste. They form the brain and spinal fluid ( CSF). The protruding part of the choroid plexus, which consists of the lateral openings of the fourth ventricle ( Aperturae lateral foramina of Luschka or ulcer quarti ), is clinically referred to as Bochdalek flower basket. The choroid plexus of the third. Ventricle and the lateral ventricles is suspended from the taenia of the thalamus ( Taenia thalami ), the fornix ( Taenia fornix ) and the fimbria fornix ( taenia fimbriae ).

The formation of the cerebrospinal fluid is essentially performed by an ultrafiltration of the blood. In addition, compared to the blood increased concentration of sodium and magnesium is achieved by active secretion ( secretion). The cerebrospinal fluid is formed at 0.3-0.4 ml / min, or about 500 ml / day. The presence of cerebrospinal fluid of about 150 ml may thus be replaced at about three times per day.

Histology

A choroid plexus consists of an invagination of the pia mater ( pia mater ) and an epithelial covering of specialized glial cells ( ependymal cells ). This single-layered cuboidal epithelium, the lamina choroid, has cilia and numerous microvilli on its surface. Underneath is a native of the pia mater vascularized connective tissue layer, the Tela chorioidea that is mesenchymal origin. The blood supply of the wire braids done by branches of the internal carotid artery and posterior cerebral artery ( caudal ).

Diseases

As Plexuszyste a harmless cystic structure in the brain of unborn children is called. A benign tumor of the choroid plexus is called a choroid plexus papilloma, a more malignant than Plexuskarzinom.