In the

brain The brain is an 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 special ...

, 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 (CNS) that are mainly made up of myelinated axons, also called tracts. Long thought to be passive tissue, white matter affects learning and brain functions, modulating the distributi ...

, 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 OBEX (abbreviation of OBject EXchange, also termed IrOBEX) is a communications protocol that facilitates the exchange of binary objects between devices. It is maintained by the Infrared Data Association but has also been adopted by the Bluetooth S ...

with the

gracile nucleus In neuroanatomy, the dorsal column nuclei are a pair of nuclei in the dorsal columns in the brainstem. The name refers collectively to the cuneate nucleus and gracile nucleus, which are present at the bottom of the medulla oblongata. Both n ...

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

inferior peduncle The upper part of the posterior district of the medulla oblongata is occupied by the inferior cerebellar peduncle, a thick rope-like strand situated between the lower part of the fourth ventricle and the roots of the glossopharyngeal and vagus nerv ...

, below the

striae medullares Winding around the inferior cerebellar peduncle in the lower part of the fourth ventricle, and crossing the area acustica and the medial eminence are a number of white strands, the medullary striae, which form a portion of the cochlear division ...

, and roofs in the lower and posterior part of the

lateral recess The lateral recess is a projection of the fourth ventricle which extends into, or rather below, the inferior cerebellar peduncle of the brainstem. The lateral aperture ( Foramen of Luschka), an opening in each extremity of the lateral recess, pr ...

; 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 ne ...

, which, however, projects beyond it like a cluster of grapes; 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 {{Portal bar, Anatomy

Additional images

See also

References