Brain: Cerebral aqueduct
Section through superior colliculus showing path of oculomotor nerve.
Drawing of a cast of the ventricular cavities, viewed from the side.
Latin	aqueductus mesencephali (cerebri)
Gray's	subject #188 806
NeuroNames	hier-500
MeSH	Cerebral+Aqueduct

The mesencephalic duct, also known as the aqueductus mesencephali, aqueduct of Sylvius or the cerebral aqueduct, contains cerebrospinal fluid (CSF), is within the mesencephalon (or midbrain) and connects the third ventricle in the diencephalon to the fourth ventricle, which is between the pons and cerebellum.

Contents 1 Pathology 2 See also 3 External links 4 Additional images

[edit] Pathology

A blockage in this duct is a cause of hydrocephalus.

[edit] See also

• List of regions in the human brain

[edit] External links

• Atlas of anatomy at UMich n2a3p2

[edit] Additional images

Coronal section through mid-brain.	Transverse section of mid-brain at level of inferior colliculi.	Transverse section of mid-brain at level of superior colliculi.	Median sagittal section of brain.
Scheme showing relations of the ventricles to the surface of the brain.

v • d • e Human brain: mesencephalon (midbrain) (TA A14.1.06, GA 9.800) Tectum (Dorsal) Surface Corpora quadrigemina: Inferior colliculi (Brachium of inferior colliculus), Superior colliculi (Brachium of superior colliculus) Grey matter Pretectal area White: Sensory/ascending Spinotectal tract · Central tegmental tract White: Motor/descending Tectospinal tract Peduncle (Ventral) Peduncle tegmentum White: Sensory/ascending lemnisci (Medial, Lateral) · Ascending MLF (Vestibulo-oculomotor fibers) · Spinothalamic tract · Anterior trigeminothalamic tract · Dentatothalamic tract White: Motor/descending Rubrospinal tract · Rubro-olivary tract · Descending MLF Grey: cranial nuclei GSA (V: Mesencephalic) - GSE (III: Oculomotor, IV: Trochlear) - GVE (III: Edinger-Westphal) Grey: other Periaqueductal gray/Raphe nuclei (Dorsal raphe nucleus) Ventral tegmental area • Pedunculopontine nucleus • Red nucleus riMLF Ventricular system Cerebral aqueduct Peduncle base White: Motor/descending Cerebral crus: Corticospinal tract · Corticobulbar tract · Corticopontine tract/Frontopontine fibers/Temporopontine fibers Grey: Substantia nigra Pars compacta · Pars reticulata Surface Superior cerebellar peduncle (Decussation of superior cerebellar peduncles) · Interpeduncular fossa

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