Corticopontine fibers

Projections from the cerebral cortex to the pontine nuclei

Corticopontine fibers
Coronal section through mid-brain. 1. Corpora quadrigemina. 2. Cerebral aqueduct. 3. Central gray stratum. 4. Interpeduncular space. 5. Sulcus lateralis. 6. Substantia nigra. 7. Red nucleus of tegmentum. 8. Oculomotor nerve, with 8’, its nucleus of origin. a. Lemniscus (in blue) with a’ the medial lemniscus and a" the lateral lemniscus. b. Medial longitudinal fasciculus. c. Raphé. d. Temporopontine fibers. e. Portion of medial lemniscus, which runs to the lentiform nucleus and insula. f. Cerebrospinal fibers. g. Frontopontine fibers.
Details
Identifiers
Latin	fibrae corticopontinae, tractus corticopontinus
NeuroNames	1322
TA98	A14.1.05.107
TA2	5619
FMA	75190
Anatomical terms of neuroanatomy [edit on Wikidata]

Corticopontine fibers^[1] are projections from the cerebral cortex to the pontine nuclei.^[2]

Depending upon the lobe of origin, they can be classified as frontopontine fibers, parietopontine fibers, temporopontine fibers or occipitopontine fibers.^[3]

References

^ Kamali A, Kramer LA, Frye RE, Butler IJ, Hasan KM (October 2010). "Diffusion tensor tractography of the human brain cortico-ponto-cerebellar pathways: a quantitative preliminary study". J Magn Reson Imaging. 32 (4): 809–17. doi:10.1002/jmri.22330. PMC 4492525. PMID 20882611.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Leergaard TB, Bjaalie JG (November 2007). "Topography of the complete corticopontine projection: From experiments to principal Maps". Front Neurosci. 1 (1): 211–23. doi:10.3389/neuro.01.1.1.016.2007. PMC 2518056. PMID 18982130.
^ http://braininfo.rprc.washington.edu/AncilDefinition.aspx?ID=1322&questID=1322^{[permanent dead link]}

External links

Cortex->Pons->Cerebellum:

https://www.csuchico.edu/~pmccaffrey/syllabi/CMSD%20320/362unit7.html

Anatomy of the pons

Dorsal/
(tegmentum)

Surface

White: Sensory

White: Motor

Grey: Cranial nuclei

afferent:	GSA Trigeminal Principal Spinal Cochlear nucleus Dorsal Anterior Vestibular nuclei Superior
efferent:	SVE: Trigeminal motor nucleus Facial motor nucleus GSE: Abducens nucleus GVE: Superior salivary nucleus Inferior salivary nucleus

Grey: Other nuclei

Ventral/
(base)

Grey	Pontine nuclei
White: Motor/descending	Corticospinal tract Corticobulbar tract Corticopontine fibers MCP Pontocerebellar fibers
Surface	Basilar sulcus

Other grey: Raphe/
reticular

Anatomy of the midbrain

Tectum
(Dorsal)

Corpora quadrigemina

Grey matter

Pretectal area

White matter

Sensory / ascending	Spinotectal tract Central tegmental tract
Motor / descending	Tectospinal tract

CSF

Cerebral aqueduct

Peduncle
(Ventral)

Tegmentum

White matter

Sensory / ascending	Lemnisci Medial Lateral Ascending MLF Vestibulo-oculomotor fibers Spinothalamic tract Anterior trigeminothalamic tract Dentatothalamic tract
Motor / descending	Rubrospinal tract Rubro-olivary tract Descending MLF

Grey matter

cranial nuclei	GSA Mesencephalic GSE Oculomotor nucleus Trochlear nucleus GVE Edinger–Westphal nucleus
Ventral tegmental area	Rostromedial tegmental nucleus
Periaqueductal gray Red nucleus Rostral interstitial nucleus of medial longitudinal fasciculus Parabrachial area Interpeduncular nucleus
Midbrain reticular formation	dorsal tegmental nucleus Raphe nuclei dorsal Reticulotegmental nucleus

Base

White / 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

Brain and spinal cord: neural tracts and fasciculi

Sensory

DCML

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

Anterolateral/
pain

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

Pyramidal

flexion: Primary motor cortex → Posterior limb of internal capsule → Decussation of pyramids → Corticospinal tract (Lateral, Anterior) → Neuromuscular junction

Extrapyramidal

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

Basal ganglia

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

Cerebellar

Afferent

Vestibular nuclei → Vestibulocerebellar tract → ICP → Cerebellum → Granule cell

Pontine nuclei → Pontocerebellar fibers → MCP → Deep cerebellar nuclei → Granule cell

Inferior olivary nucleus → Olivocerebellar tract → ICP → Hemisphere → Purkinje cell → Deep cerebellar nuclei

Efferent

Dentate nucleus in Lateral hemisphere/pontocerebellum → SCP → Dentatothalamic tract → Thalamus (VL) → Motor cortex

Interposed nucleus in Intermediate hemisphere/spinocerebellum → SCP → Reticular formation, or → Cerebellothalamic tract → Red nucleus → Thalamus (VL) → Motor cortex

Fastigial nucleus in Flocculonodular lobe/vestibulocerebellum → Vestibulocerebellar tract → Vestibular nuclei

Bidirectional:
Spinocerebellar

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)