Cranial nerves arising from the midbrain III IV

The oculomotor nerve (III) arises from the interpeduncular fossa on the ventral aspect of the midbrain.

Table 1.2. Attachments and foramina of cranial nerves.

Brain attachment

Forebrain Telencephalon: limbic system Diencephalon: lateral geniculate body

Midbrain

Upper midbrain, ventral, interpeduncular fossa Lower midbrain, dorsal, below inferior colliculi

Hindbrain Pons, lateral aspect

Pontomedullary junction Near midline Cerebellopontine angle

Cerebellopontine angle Medulla

Rootlets, lateral to inferior olive, extending down to cervical cord Rootlets between pyramid and olive

Nerve Foramen or canal (cranial bone in brackets)

I Cribriform plate (ethmoid)

II Optic canal (sphenoid)

III Superior orbital fissure (sphenoid)

IV Superior orbital fissure (sphenoid)

V Va: superior orbital fissure (sphenoid) Vb: foramen rotundum (sphenoid) Vc: foramen ovale (sphenoid)

VI Superior orbital fissure (sphenoid)

VII Internal acoustic meatus, facial canal, stylomastoid foramen (temporal)

VIII Internal acoustic meatus (temporal)

IX, X, XI Jugular foramen (between occipital and temporal bones)

XII Hypoglossal canal (occipital)

Midbrain Olive Pons
Fig. 1.1 Attachments of cranial nerves. Anterior view: study with brain stem specimen.

The trochlear nerve (IV) is the only cranial nerve to arise from the dorsal aspect of the brain stem; it arises just below the inferior colliculus.

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  • SEMHAR
    Which cranial nerves arise from the midbrain?
    8 years ago

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