| Lateral aperture | |
| Latin: | apertura lateralis ventriculi quarti |
| Acronym: | LA4V |
The lateral aperture of the fourth ventricle or foramen of Luschka (after anatomist Hubert von Luschka)[1] is an opening at the lateral extremity of either lateral recess of the fourth ventricle opening anteriorly[2] into (sources differ) the pontine cistern/lateral cerebellomedullary cistern[3] at cerebellopontine angle. A tuft of choroid plexus commonly extends into the lateral aperture, partially obstructing CSF flow through this aperture.[4]
The opening of the lateral aperture occurs just lateral to the cranial nerve VIII, and proximally to the flocculus of cerebellum.