Taenia of fourth ventricle
Rhomboid fossa. (Taenia of fourth ventricle labeled at bottom left.)
Theformatio reticularis of themedulla oblongata, shown by a transverse section passing through the middle of theolive. (Testut.) 1.Anterior median fissure. 2.Fourth ventricle. 3.Formatio reticularis, with 3’, its internal part (reticularis alba), and 3’’, its external part (reticularis grisea). 4.Raphé. 5.Pyramid. 6.Lemniscus. 7.Inferior olivary nucleus with the twoaccessory olivary nuclei. 8.Hypoglossal nerve, with 8’, its nucleus of origin. 9.Vagus nerve, with 9’, its nucleus of termination. 10.Lateral dorsal acoustic nucleus. 11.Nucleus ambiguus (nucleus of origin of motor fibers ofglossopharyngeal,vagus, and cerebral portion ofspinal accessory). 12.Gracile nucleus. 13.Cuneate nucleus. 14. Head ofposterior column, with 14’, the lower sensory root oftrigeminal nerve. 15.Fasciculus solitarius. 16.Anterior external arcuate fibers, with 16’, thenucleus arcuatus. 17.Nucleus lateralis 18. Nucleus offasciculus teres. 19.Lingula.
Details
Identifiers
Latin	taenia ventriculi quarti
NeuroNames	632
Anatomical terms of neuroanatomy [edit on Wikidata]

In thebrain, thetaenia of the fourth ventricle (lingula,tenia of fourth ventricle) are two narrow bands ofwhite matter, one on either side, which complete the lower part of theroof of thefourth ventricle.

Each consists of a vertical and a horizontal part.

• Thevertical part is continuous below theobex with thegracile nucleus, to which it is adherent by its lateral border.
• Thehorizontal portion extends transversely across theinferior peduncle, below thestriae medullares, and roofs in the lower and posterior part of thelateral recess; it is attached by its lower margin to the inferior peduncle, and partly encloses thechoroid plexus, which, however, projects beyond it like acluster of grapes; and hence this part of the tænia has been termed thecornucopia.

• 
  Hind-brain of a human embryo of three months—viewed from behind and partly from left side.
• 
  Section of the medulla oblongata at about the middle of the olive.
• 
  Transverse section of medulla oblongata below the middle of the olive.

• Fourth ventricle

This article incorporates text in thepublic domain frompage 797 of the 20th edition ofGray's Anatomy(1918)

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