Taenia of fourth ventricle
Encyclopedia
In the brain
, the taenia of the fourth ventricle (ligula, tenia of fourth ventricle) are two narrow bands of white matter
, one on either side, which complete the lower part of the roof of the fourth ventricle.
Each consists of a vertical and a horizontal part.
Brain
The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few primitive invertebrates such as sponges, jellyfish, sea squirts and starfishes do not have one. It is located in the head, usually close to primary sensory apparatus such as vision, hearing,...
, the taenia of the fourth ventricle (ligula, tenia of fourth ventricle) are two narrow bands of white matter
White matter
White matter is one of the two components of the central nervous system and consists mostly of myelinated axons. White matter tissue of the freshly cut brain appears pinkish white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries. Its white color is due to...
, one on either side, which complete the lower part of the roof of the fourth ventricle.
Each consists of a vertical and a horizontal part.
- The vertical part is continuous below the obexObexThe obex is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord.The obex occurs in the caudal medulla.The decussating of sensory fibers happens at this point....
with the clavaClavaClava can refer to:* Mu Boötis, a triple star system in the constellation Boötes.* Clava cairn, a type of Bronze Age circular chamber tomb cairn....
, to which it is adherent by its lateral border.
- The horizontal portion extends transversely across the inferior peduncle, below the striæ medullares, and roofs in the lower and posterior part of the lateral recessLateral recessThe lateral recess is a projection of the fourth ventricle which extends into the inferior cerebellar peduncle of the brainstem. The lateral aperture, an opening in each extremity of the lateral recess, provides a conduit for cerebrospinal fluid to flow from the brain's ventricular system into the...
; it is attached by its lower margin to the inferior peduncle, and partly encloses the choroid plexusChoroid plexusThe choroid plexus is a structure in the ventricles of the brain where cerebrospinal fluid is produced...
, which, however, projects beyond it like a cluster of grapes; and hence this part of the tænia has been termed the cornucopia.