Table of Contents
What are the inputs of the cerebellum?
The vestibular and spinal inputs provide the cerebellum with information from the labyrinth in the ear, from muscle spindles, and from other mechanoreceptors that monitor the position and motion of the body.
Where does the Vestibulocerebellum receive input from?
vestibular nuclei
This portion of the cerebellum comprises the caudal lobes of the cerebellum and includes the flocculus and the nodulus. As its name suggests, the vestibulocerebellum receives input from the vestibular nuclei in the brainstem and is primarily concerned with the regulation of movements underlying posture and equilibrium.
What is the function of the Vestibulocerebellum?
The vestibulocerebellum functions to maintain the stability of the head on the body. It acts on the neck muscles via the lateral VST, to maintain a steady head position despite movements of the body, and thereby maintains visual fixation on distant objects, such as when a person is running or in a moving vehicle.
Which lobe of the cerebellum is responsible for vestibular input?
The vestibular nuclei receive input from the flocculonodular lobe and from the vestibular labyrinth.
What are the two most direct inputs to the Purkinje cells of the cerebellum?
The Purkinje cells receive two types of excitatory input from outside of the cerebellum, one directly from the climbing fibers and the other indirectly via the parallel fibers of the granule cells.
Which fibers provide excitatory input to the cerebellum?
Each climbing fiber will form synapses with 1-10 Purkinje cells….
| Climbing fiber | |
|---|---|
| Location | Inferior olive and Cerebellum |
| Shape | Unique projection neuron (see text) |
| Function | Unique excitatory function (see text) |
| Neurotransmitter | Glutamate |
What is cortico ponto-cerebellar pathway?
The cortico-ponto-cerebellar pathway (orange arrows) connects the cerebrum with the cerebellum passing through the pons and the contralateral middle cerebellar peduncle (MCP).
What possible symptoms may arise from lesions to the Vestibulocerebellum?
Symptoms of vestibulocerebellar syndrome may appear in early childhood but the full onset of neurological symptoms including nystagmus (involuntary eye movement), ataxia (loss of voluntary muscle coordination), and tinnitus (perception of sound in the absence of external stimulation) does not occur until early …
Where is vestibular input processed in the brain?
The vestibular labyrinth is made up of the semicircular canals and the otolith organs (all discussed below), and contains receptors for vestibular sensations. These receptors send vestibular information via the vestibulocochlear nerve to the cerebellum and to nuclei in the brainstem called the vestibular nuclei.
Do Purkinje cells receive input from granule cells?
Which of the following is a direct source of excitatory input to the Purkinje cells of the cerebellar cortex?
Vestibulocerebellum. Which of the following is a direct source of excitatory input to the Purkinje cells of the cerebellar cortex? Climbing fibers.
Where does the cortico ponto-cerebellar pathway Decussate?
The cortico-ponto-cerebellar pathway, composed of the corticopontine tract and the pontocerebellar tract, is major afferent fibers through the middle cerebellar peduncle. It arises from the cerebral cortex and enters the ipsilateral pontine nucleous and almost entirely crossed to the contralateral cerebellum.
What does Flocculus mean?
Definition of flocculus 1 : a small loosely aggregated mass. 2 : a bright or dark patch on the sun.
What are Flocculi?
The flocculus (Latin: tuft of wool, diminutive) is a small lobe of the cerebellum at the posterior border of the middle cerebellar peduncle anterior to the biventer lobule. Like other parts of the cerebellum, the flocculus is involved in motor control.