USMLE Step 1 Neuroanatomy Review 25 05 Summary Ventricular System
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Play USMLE Audio MP3 25 05 Summary Ventricular System Below
Begin 25 05 Summary Ventricular System Transcription
Student doctor, please pause and summarize the ventricular system. Please refer to figure 2.1 as necessary.
The brain contains four ventricles that are interconnected by the various foramina.
The lateral ventricles are the largest ventricles and are located medially within the cerebral hemispheres.
The lateral ventricles are separated from each other by the septum pellucidum, and each lateral ventricle communicates with the third ventricle by the interventricular foramen of Monro.
The third ventricle is located medially within the thalamus.
The third ventricle communicates with the fourth ventricle via the aqueduct of Sylvius.
The fourth ventricle is located between the posterior surfaces of the pons and upper medulla and the anterior surface of the cerebellum.
The fourth ventricle communicates with the subarachnoid space via three foramina, of which two are lateral and the other medial.
The two lateral foramina are the foramina of Luschka, and the medial is the foramen of Magendie.
The fourth ventricle is continuous with the central canal of the lower medulla and spinal cord.
This central canal extends down the center of the spinal cord.
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