Which of the following foramen is responsible for the drainage of CSF from lateral to third ventricle?
The two interventricular foramens, or foramens of Monro, are apeures between the column of the fornix and the anterior end of the thalamus. The two lateral ventricles communicate with the third ventricle through these foramens and drainage of CSF occurs. The lateral apeure (foramen of Luschka) is the opening of the lateral recess into the subarachnoid space near the flocculus of the cerebellum. A tuft of choroid plexus is commonly present in the apeure and paly obstructs the flow of CSF from the fouh ventricle to the subarachnoid space. The medial apeure (foramen of Magendie) is an opening in the caudal poion of the roof of the ventricle. Most of the outflow of CSF from the fouh ventricle passes through this apeure. The cerebral aqueduct is a narrow, curved channel running from the posterior third ventricle into the fouh. Ref: Waxman S.G. (2010). Chapter 11. Ventricles and Coverings of the Brain. In S.G. Waxman (Ed), Clinical Neuroanatomy, 26e.
Foramen of Monro
Foramen of Luschka
Foramen of Magendie
Cerebral aqueduct