- Obex
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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 For the protocol, 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.
The decussating of sensory fibers happens at this point.
Clinical significance
Hemangioblastoma has been observed in this location.[1] Neurological surgical intervention in the treatment of syringomyelia or hydromyelia may involve plugging the obex to prevent the transmission of cerebrospinal fluid to the central canal of the spinal cord.
References
- ^ Pavesi G, Berlucchi S, Feletti A, Opocher G, Scienza R (July 2006). "Hemangioblastoma of the obex mimicking anorexia nervosa". Neurology 67 (1): 178–9. doi:10.1212/01.wnl.0000223354.86636.ed. PMID 16832109. http://www.neurology.org/cgi/pmidlookup?view=long&pmid=16832109.
External links
- Photo at aphis.usda.gov (file not found as of 2008-08-16)
Human brain: rhombencephalon, myelencephalon: medulla (TA A14.1.04, GA 9.767) Dorsal SurfacePosterior median sulcus · Posterolateral sulcus · Area postrema · Vagal trigone · Hypoglossal trigone · Medial eminenceafferent: GVA: VII,IX,X: Solitary/tract/Dorsal respiratory group · SVA: Gustatory nucleus · GSA: VIII-v (Lateral, Medial, Inferior)
efferent: GSE: XII · GVE: IX,X,XI: Ambiguus · SVE: X: Dorsal · IX: Inferior salivatory nucleusGrey: otherWhite: Sensory/ascendingWhite: Motor/descendingVentral White: Motor/descendingVentral respiratory group · Arcuate nucleus of medulla · Inferior olivary nucleus · Rostral ventromedial medullaSurfaceGrey: Raphe/
reticularVentricular system, rhombencephalon, met- and myel-: fourth ventricle (TA A14.1.05.701–726, GA 9.797) Roof (dorsal) rostral: Superior medullary velum (Frenulum)
caudal: Inferior medullary velum · Taenia of fourth ventricleFloor/rhomboid fossa (ventral) rostral (pons): Facial colliculus · Locus coeruleus
caudal (medulla}: Vagal trigone · Hypoglossal trigone · Area postrema · Obex
Medial eminence · Sulcus limitansApertures Other Tela chorioidea of fourth ventricle · FastigiumCategories:- Neuroanatomy stubs
- Neuroanatomy
- Brainstem
- Central nervous system
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