median aperture of fourth ventricle

(redirected from arachnoid foramen)

me·di·an ap·er·ture of fourth ven·tri·cle

[TA]
the large midline opening in the posterior inferior part of the roof of the fourth ventricle, connecting the ventricle with the posterior cerebellomedullary cistern (cisterna magna).

median aperture of fourth ventricle

an opening between the roof of the fourth ventricle and the subarachnoid space.

me·di·an ap·er·ture of fourth ven·tri·cle

(mē-dē'ăn ap'ĕr-chŭr fōrth ven'tri-kĕl) [TA]
The large midline opening in the posterior inferior part of the roof of the fourth ventricle, connecting the ventricle with the posterior cerebellomedullary cistern.
Synonym(s): apertura mediana ventriculi quarti [TA] .