Cerebellar tonsil

In the volumetric brain

The Territory

Structure. The cerebellar tonsils are the paired rounded lobules at the posterior vermis' inferolateral aspect (lobule H IX), straddling the foramen magnum's rim — the lowest paramedian cerebellar structures, directly above the medulla.

Function. The foramen magnum's sentinels: their descent (Chiari I malformation, or herniation under pressure) compresses the medulla's vital centres and dams CSF — tonsillar herniation is the terminal event of posterior-fossa pressure; their position also gates the classic Chiari headache and syrinx mechanisms.

The Levers — graded instruments & the levers to come

Behaviour · Action · Thought — the tagged profile

The Network — what fires with this region

Papers on disk — 130 full texts

The Evidence — Neurosynth studies (98)

The Evidence — NeuroQuery studies (109)

The Exploration Guide

*Cerebellum · Mai atlas of record · 98 studies · 90 papers on disk*

The cerebellar tonsils straddle the foramen magnum's rim — the brain's lowest paramedian sentinels, and the structure whose herniation is the terminal event of rising intracranial pressure.

The Territory

The cerebellar tonsils are the paired rounded lobules at the posterior vermis' inferolateral aspect (lobule H IX), straddling the foramen magnum's rim — the lowest paramedian cerebellar structures, directly above the medulla.

*— {'source': 'Naidich, Duvernoy, Delman, Sorensen, Kollias & Haacke', 'work': "Duvernoy's Atlas of the Human Brain Stem and Cerebellum: High-Field MRI, Springer", 'kind': 'atlas', 'locator': 'cerebellum, inferior surface'}*

What It Does

The foramen magnum's sentinels: their descent (Chiari I malformation, or herniation under pressure) compresses the medulla's vital centres and dams CSF — tonsillar herniation is the terminal event of posterior-fossa pressure; their position also gates the classic Chiari headache and syrinx mechanisms.

The functional record is anatomically urgent: their descent (Chiari I malformation, or herniation under pressure) compresses the medulla's vital centres and dams CSF. The decoded profile is cerebellar motor plus interoceptive pain — the tonsil's role in the Chiari headache is literally its own compression. The adjacency harvest gave this dossier its literature (cerebellar tonsil papers live inside the cerebellum's); no graded instrument is assigned — a structure defined by its position rather than a dedicated function.

*— {'source': 'Josephine C. Moore', 'work': 'Brain Atlas and Functional Systems', 'kind': 'atlas', 'locator': 'cerebellum, functional systems'}*

The Network

Premotor/SMA (120 shared studies), supplementary motor area (86), precentral gyrus (74), vermis (64) — the motor system's cerebellar edge.

Co-activation partners of record: BA 6 - premotor/SMA:120, Supplementary motor area:86, Precentral gyrus:74, Vermis of cerebellum:64, Superior parietal lobule:63, Dentate nucleus:63, Dentate nucleus:60, Medulla oblongata:55.

When It Fails

Chiari I descent: foramen magnum crowding, medullary compression, syrinx formation — the tonsil's failure-mode is mechanical, and it is the most surgical page in this atlas.

The Evidence

• Comparison of eyeblink conditioning in patients with superior and posterior (2003) — 10.1093/brain/awg011
• Searching for a structural endophenotype in psychosis using computational m (2003) — 10.1016/S0925-4927(02)00125-7
• Cerebellar responses evoked by nociceptive leg withdrawal reflex as reveale (2003) — 10.1152/jn.00053.2003
• Cerebral regions processing first- and higher-order motion in an opposed-di (2003) — 10.1046/j.1460-9568.2003.02571.x
• Cerebellar and premotor function in bimanual coordination: parametric neura (2004) — 10.1016/j.neuroimage.2003.12.011
• Playing piano in the mind--an fMRI study on music imagery and performance i (2004) — 10.1016/j.cogbrainres.2003.12.005

98 studies total touch this region in the Neurosynth corpus of record; the full literature lives beside this dossier.

The Levers

• No graded instrument touches this region yet — the lever family for this structure is an open slot in the matrix; the tagged profile names its candidates.

Candidate levers (Neurosynth-decoded terms — cerebellar(anatomy-reference), cerebellum(anatomy-reference), motor(action-motor), pain(interoception), movements(action-motor), coordination(action-motor), resting state(method-other), networks(anatomy-reference) …) are the foundation for the thousands of instruments to come; they are ungraded by law.

Explore Further

BA 6 - premotor/SMA:120, Supplementary motor area:86, Precentral gyrus:74, Vermis of cerebellum:64 — each name is a dossier stop in this explorer.

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