Obex

Brain: Obex

Hind-brain of a human embryo of three months—viewed from behind and partly from left side.

Rhomboid fossa.
Gray's	subject #187 797
NeuroNames	hier-633
Dorlands/Elsevier	o_01/12585770

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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v • d • e Ventricular system

General	Choroid plexus - Circumventricular organs

Lateral ventricles	Body of lateral ventricle - Anterior horn of lateral ventricle - Posterior horn of lateral ventricle - Inferior horn of lateral ventricle - Calcar avis - Collateral eminence - Lamina affixa

Third ventricle	recesses: (Optic recess, Infundibular recess, Suprapineal recess, Pineal recess) Hypothalamic sulcus - Tela chorioidea of the third ventricle Subfornical organ

Fourth ventricle	Lateral recess - Tela chorioidea of the fourth ventricle - Taenia of fourth ventricle roof: Superior medullary velum - Inferior medullary velum floor/rhomboid fossa: Vagal trigone - Hypoglossal trigone - Obex - Sulcus limitans - Facial colliculus - Medial eminence

Apertures	Interventricular/Monro - Cerebral aqueduct/Sylvius - Median/Magendie and Lateral/Luschka

Obex is also a verb meaning "to throw in the way of" or "to hinder."