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'''Obex''' is a term used in neuroanatomy that refers to the point in the brain where the [[central canal]] of the [[spinal cord]] meets the [[fourth ventricle]]. The obex is located in the [[medulla oblongata]], near the [[pons]]. It is an important landmark in the brain as it marks the official end of the [[fourth ventricle]] and the beginning of the [[central canal]].

== Anatomy ==

The obex is located in the [[medulla oblongata]], which is the lower half of the brainstem. It is situated near the [[pons]], another part of the brainstem, and is anterior to the [[cerebellum]]. The obex is a slight depression which marks the point where the [[fourth ventricle]] narrows to become the [[central canal]] of the [[spinal cord]].

== Function ==

The obex serves as an important landmark in the brain. It marks the point where the [[fourth ventricle]] narrows to become the [[central canal]] of the [[spinal cord]]. This is significant as the [[fourth ventricle]] is one of the four connected fluid-filled cavities within the human brain. These ventricles are responsible for the production, transport and removal of cerebrospinal fluid, which is crucial for the brain's functioning.

== Clinical significance ==

The location of the obex is significant in medical procedures such as [[lumbar puncture]], where a sample of cerebrospinal fluid is taken for diagnostic purposes. The obex is also important in the study of certain diseases such as [[mad cow disease]] and other [[prion diseases]], as it is one of the areas of the brain that these diseases often affect.

== See also ==
* [[Central canal]]
* [[Fourth ventricle]]
* [[Medulla oblongata]]
* [[Pons]]
* [[Cerebellum]]

[[Category:Neuroanatomy]]
[[Category:Brainstem]]
[[Category:Medulla oblongata]]

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Obex - Revision history

Prab: CSV import

Prab: CSV import