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Obex
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The obex, Latin for barrier, is a small fold on the posterior surface of the medulla oblongata, located at the inferior apex of the fourth ventricle. It is formed by the unison of the left and right taeniae and divides the medulla oblongata into a closed part below containing the central canal and an open part above containing the inferior portion of the fourth ventricle.
The obex extends into the central canal of the brainstem and allows passage of cerebrospinal fluid from the fourth ventricle to the central canal.
| Terminology |
English: Obex Latin: Obex |
| Definition | Small fold located at the inferior apex of the fourth ventricle which extends into the central canal of the brainstem |
Learn more about the ventricles of the brain with this study unit (and article):
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