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- This article is about obex portion of the brain. For the communications protocol "OBEX" (Object Exchange), see OBEX
The obex (from the Latin for barrier) is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord. The obex occurs in the caudal medulla.
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MYELENCEPHALON/MEDULLA: arcuate nucleus of medulla, solitary nucleus, hypoglossal nucleus, nucleus ambiguus, olivary body, inferior olivary nucleus, cuneate nucleus, accessory cuneate nucleus, gracile nucleus, inferior salivatory nucleus, raphe nuclei (obscurus, magnus, pallidus), area postrema, posterior nucleus of vagus nerve
METENCEPHALON/CEREBELLUM: cerebellar vermis, flocculus, arbor vitae
METENCEPHALON/PONS: pontine tegmentum, superior salivary nucleus, trapezoid body, pontine nuclei (superior olivary nucleus, trigeminal nerve nuclei, abducens nucleus, facial motor nucleus, cochlear nuclei, vestibular nuclei), locus ceruleus, paramedian pontine reticular formation, nucleus centralis superior
FOURTH VENTRICLE: obex, median aperture
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