Cerebrospinal fibers

Cerebrospinal fibers
Coronal section through mid-brain. Corpora quadrigemina. Cerebral aqueduct. Central gray stratum. Interpeduncular space. Sulcus lateralis. Substantia nigra. Red nucleus of tegmentum. Oculomotor nerve, with 8’, its nucleus of origin Lemniscus (in blue) with a’ the medial lemniscus and a" the lateral lemniscus Medial longitudinal fasciculus Raphé Temporopontine fibers Portion of medial lemniscus, which runs to the lentiform nucleus and insula Cerebrospinal fibers Frontopontine fibers
Details
Latin	Fibrae cerebrospinales
*Anatomical terms of neuroanatomy*

The cerebrospinal fibers, derived from the cells of the motor area of the cerebral cortex, occupy the middle three-fifths of the base; they are continued partly to the nuclei of the motor cranial nerves, but mainly into the pyramids of the medulla oblongata.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

Anatomy of the midbrain

Tectum
(Dorsal)

Surface	Corpora quadrigemina: Inferior colliculus Brachium Superior colliculus Brachium
Grey matter	Pretectal area
White: Sensory/ascending	Spinotectal tract Central tegmental tract
White: Motor/descending	Tectospinal tract

Peduncle
(Ventral)

White: Sensory/ascending

White: Motor/descending

Grey: other

Periaqueductal gray Raphe nuclei dorsal
Ventral tegmental area Rostromedial tegmental nucleus Pedunculopontine nucleus
Red nucleus Rostral interstitial nucleus of medial longitudinal fasciculus Parabrachial area
Interpeduncular nucleus Midbrain reticular formation

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 Interpeduncular fossa

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