In the

brain The brain is an organ (biology), organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It consists of nervous tissue and is typically located in the head (cephalization), usually near organs for ...

, the taenia of the fourth ventricle (lingula, tenia of fourth ventricle) are two narrow bands of

white matter White matter refers to areas of the central nervous system that are mainly made up of myelinated axons, also called Nerve tract, tracts. Long thought to be passive tissue, white matter affects learning and brain functions, modulating the distr ...

, one on either side, which complete the lower part of the roof of the

fourth ventricle The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. These cavities, known collectively as the ventricular system, consist of the left and right lateral ventricles, the third ventricle, and the fourth ...

. Each consists of a vertical and a horizontal part. * The ''vertical part'' is continuous below the

obex The obex () is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord. Cerebrospinal fluid can flow from the fourth ventricle into the obex. In anatomical studies, the obex has been fo ...

with the

gracile nucleus The dorsal column nuclei are a pair of nuclei in the dorsal columns of the dorsal column–medial lemniscus pathway (DCML) in the brainstem. The name refers collectively to the cuneate nucleus and gracile nucleus, which are situated at the lo ...

, to which it is adherent by its lateral border. * The ''horizontal portion'' extends transversely across the

inferior peduncle The inferior cerebellar peduncle is formed by fibers of the restiform body that join with fibers from the much smaller juxtarestiform body. The inferior cerebellar peduncle is the smallest of the three cerebellar peduncles. The upper part of th ...

, below the striae medullares, and roofs in the lower and posterior part of the

lateral recess The lateral recess or lateral recess of fourth ventricle, is a projection of the fourth ventricle which extends to the lateral border of the brainstem at the pontomedullary junction. At this point the fourth ventricle is at its widest. The late ...

; it is attached by its lower margin to the inferior peduncle, and partly encloses the

choroid plexus The choroid plexus, or plica choroidea, is a plexus of cells that arises from the tela choroidea in each of the ventricles of the brain. Regions of the choroid plexus produce and secrete most of the cerebrospinal fluid (CSF) of the central ...

, which, however, projects beyond it like a

cluster of grapes In viticulture, the grape cluster (also bunch of grapes) is a fertilized inflorescence of the grapevine, the primary part of this plant used for food (grape leaves are also used in some culinary traditions). The size of the grape bunch greatly va ...

; and hence this part of the tænia has been termed the ''cornucopia''.

Additional images

File:Gray649.png, Hind-brain of a human embryo of three months—viewed from behind and partly from left side. File:Gray694.png, Section of the medulla oblongata at about the middle of the olive. File:Gray695.png, Transverse section of medulla oblongata below the middle of the olive.

References

Ventricular system {{Neuroanatomy-stub

Additional images

See also

References