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Flocculonodular lobe

Flocculonodular lobe
Schematic representation of the major anatomical subdivisions of the cerebellum. Superior view of an "unrolled" cerebellum, placing the vermis in one plane.
Basal view of a human brain
Identifiers
NeuroNames679
NeuroLex IDbirnlex_904
TA98A14.1.07.301
TA25799
FMA72253
Anatomical terms of neuroanatomy

The flocculonodular lobe (vestibulocerebellum) is one of the lobes of the cerebellum. It is a small lobe consisting of the unpaired midline nodule and the two flocculi: one flocculus on either side of the nodule. The lobe is involved in maintaining posture and balance as well as coordinating head-eye movements.[1]

The lobe is functionally associated with the vestibular system and is therefore also referred to as the vestibulocerebellum. It receives second-order fiber afferents from the vestibular nuclei as well as direct first-order afferents from the vestibular ganglion/nerve (the only region of the cerebellum to do so).[1]

The lobe in turn projects efferents back to the vestibular nuclei which in turn give rise or project to: the lateral vestibulospinal tracts which maintain posture and balance by regulating tone of the axial and proximal limb extensor mucles (i.e. the antigravity muscles); the medial vestibulospinal tracts which regulate the tone of neck muscles; and the medial longitudinal fasciculi which coordinates head-eye movements (vestibuloocular reflex).[1]

Anatomy

Afferents

Afferents of the lobe are the vestibulocerebellar fibers arising from either the vestibular nuclei or the vestibular nerve/ganglion directly.

Efferents

Efferents of the lobe are the cerebellovestibular fibers which project to the vestibular nuclei.

Clinical significance

Lesions to this area can result in multiple deficits in visual tracking and oculomotor control (such as nystagmus and vertigo), integration of vestibular information for eye and head control, as well as control of axial muscles for balance.[2]

The most common cause of damage to the flocculonodular lobe is medulloblastoma in childhood.[citation needed]

References

  1. ^ a b c Patestas, Maria A.; Gartner, Leslie P. (2016). A Textbook of Neuroanatomy (2nd ed.). Hoboken, New Jersey: Wiley-Blackwell. pp. 287–288. ISBN 978-1-118-67746-9.
  2. ^ "Chapter 8B: Cerebellar Systems". Archived from the original on 2018-10-20. Retrieved 2012-05-06.

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