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Brain: Obex
Gray649
Hind-brain of a human embryo of three months—viewed from behind and partly from left side.
Gray709
Rhomboid fossa.
Latin '
Gray's subject #187 797
Part of
Components
Artery
Vein
BrainInfo/UW hier-633
MeSH [1]

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.


External linksEdit


v·d·e
Brain: rhombencephalon (hindbrain)
Metencephalon/
pons

Dorsal/
(tegmentum)

surface: Locus ceruleus

Trigeminal lemniscus (Dorsal trigeminal tract, Ventral trigeminal tract)

cranial nuclei: GSA: Principal V/Spinal V - VIII-c (Dorsal, Anterior)/VIII-v (Lateral, Superior, Medial, Inferior) - SVE: Motor V - VII - GSE: VI - GVE: VII: Superior salivary nucleus

MLF, III, IV and VI (vestibulo-oculomotor fibers, medial vestibulospinal tract)

sensory/ascending: Trapezoid body/VIII - Superior olivary nucleus

Inferior cerebellar peduncle (Vestibulocerebellar tract)

motor/descending: Apneustic center • Pneumotaxic center (Medial parabrachial nucleus) - Lateral parabrachial nucleus

Ventral/
(base)

Middle cerebellar peduncles (Pontocerebellar fibers) - Pontine nuclei
motor/descending: Corticospinal tract - Corticobulbar tract - Corticopontine fibers

Raphe/reticular

Reticular formation (Caudal, Oral, Tegmental, Paramedian) • Raphe nuclei (Median)


Myelencephalon/
medulla

Dorsal

surface: Posterior median sulcus - Postero-lateral sulcus - Area postrema

cranial nuclei: GVA: VII,IX,X: Solitary/tract • SVA: Gustatory nucleus • GSE: XII  • GVE: IX,X,XI: Ambiguus • SVE: X: Dorsal • IX: Inferior salivatory nucleus - MLF, III, IV and VI

sensory/ascending: Gracile nucleus • Cuneate nucleus (Accessory cuneate nucleus) • Sensory decussation  • Medial lemniscus

motor/descending: Dorsal respiratory group

Ventral

motor/descending: Ventral respiratory group - Pyramid (Motor decussation) - Inferior olivary nucleus (Olivocerebellar tract, Rubro-olivary tract)
surface: Anterior median fissure - Antero-lateral sulcus - Arcuate nucleus of medulla - Olivary body

Raphe/reticular

Reticular formation (Gigantocellular, Parvocellular, Ventral, Lateral, Paramedian) • Raphe nuclei (Obscurus, Magnus, Pallidus)

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