Magnocellular red nucleus

Magnocellular red nucleus
Identifiers
NeuroLex ID	Magnocellular part of red nucleus
*Anatomical terms of neuroanatomy* [edit on Wikidata]

This article is about the magnocellular red nucleus. For other uses, see Magnocellular.

The magnocellular red nucleus (RNm) is located in the rostral midbrain and is involved in motor coordination. Together with the parvocellular red nucleus, it makes up the red nucleus.^[1]

References

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 Pedunculopontine nucleus Red nucleus

Rostral interstitial nucleus of medial longitudinal fasciculus

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

Sensory/
ascending

1°:	Pacinian corpuscle/Meissner's corpuscle → Posterior column (Gracile fasciculus/Cuneate fasciculus) → Gracile nucleus/Cuneate nucleus

2°:	→ sensory decussation/arcuate fibers (Posterior external arcuate fibers, Internal arcuate fibers) → Medial lemniscus/Trigeminal lemniscus → Thalamus (VPL, VPM)

3°:	→ Posterior limb of internal capsule → Postcentral gyrus

Fast/lateral	1° (Free nerve ending → A delta fiber) → 2° (Anterior white commissure → Lateral and Anterior Spinothalamic tract → Spinal lemniscus → VPL of Thalamus) → 3° (Postcentral gyrus) → 4° (Posterior parietal cortex) 2° (Spinomesencephalic tract → Superior colliculus of Midbrain tectum)

Slow/medial	1° (Group C nerve fiber → Spinoreticular tract → Reticular formation) → 2° (MD of Thalamus) → 3° (Cingulate cortex)

Motor/
descending

Pyramidal

flexion:	Primary motor cortex → Genu of internal capsule → Corticobulbar tract → Facial motor nucleus → Facial muscles

flexion:	Red nucleus → Rubrospinal tract

extension:	Vestibulocerebellum → Vestibular nuclei → Vestibulospinal tract

extension:	Vestibulocerebellum → Reticular formation → Reticulospinal tract

Midbrain tectum → Tectospinal tract → muscles of neck

direct:	1° (Motor cortex → Striatum) → 2° (GPi) → 3° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of Thalamus) → 4° (Thalamocortical radiations → Supplementary motor area) → 5° (Motor cortex)

indirect:	1° (Motor cortex → Striatum) → 2° (GPe) → 3° (Subthalamic fasciculus → Subthalamic nucleus) → 4° (Subthalamic fasciculus → GPi) → 5° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of Thalamus) → 6° (Thalamocortical radiations → Supplementary motor area) → 7° (Motor cortex)

nigrostriatal pathway:	Pars compacta → Striatum

Afferent

Efferent

Unconscious proprioception	lower limb → 1° (muscle spindles → DRG) → 2° (Posterior thoracic nucleus → Dorsal/posterior spinocerebellar tract → ICP → Cerebellar vermis) upper limb → 1° (muscle spindles → DRG) → 2° (Accessory cuneate nucleus → Cuneocerebellar tract → ICP → Anterior lobe of cerebellum)

Reflex arc	lower limb → 1° (Golgi tendon organ) → 2° (Ventral/anterior spinocerebellar tract→ SCP → Cerebellar vermis) upper limb → 1° (Golgi tendon organ) → 2° (Rostral spinocerebellar tract → ICP → Cerebellum)

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