Obex
Obex
Obex (pronounced: /ˈoʊbɛks/) is a term used in neuroanatomy to refer to the point in the brain where the fourth ventricle narrows to become the central canal of the spinal cord. The term is derived from the Latin word for "barrier" or "obstacle", reflecting its role as a boundary within the brain's ventricular system.
Anatomy
The obex is located in the medulla oblongata, a part of the brainstem. It marks the lower limit of the fourth ventricle and the beginning of the central canal. The obex is an important anatomical landmark, as it is used to define the boundary between the upper and lower parts of the medulla.
Function
The obex plays a crucial role in the circulation of cerebrospinal fluid (CSF). It acts as a conduit, allowing CSF to flow from the fourth ventricle into the central canal and then around the brain and spinal cord. This circulation of CSF is essential for cushioning the brain and spinal cord, removing waste products, and delivering nutrients.
Related Terms
- Fourth ventricle: A cavity in the brain filled with cerebrospinal fluid, located between the cerebellum and the dorsal side of the pons and medulla oblongata.
- Central canal: A small canal that runs through the center of the spinal cord, carrying cerebrospinal fluid.
- Medulla oblongata: The lower half of the brainstem, containing the cardiac, respiratory, vomiting and vasomotor centers and dealing with autonomic functions such as breathing, heart rate and blood pressure.
See Also
External links
- Medical encyclopedia article on Obex
- Wikipedia's article - Obex
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