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11g - functions of cerebellum - Coggle Diagram
11g -
functions of cerebellum
Control of Body Posture and Equilibrium
The flocculonodular lobe (vestibulo-cerebellum) is concerned with
control of body posture and equilibrium.
Afferents from the vestibular apparatus pass directly or after relay in
the vestibular nuclei to the flocculonodular lobe.
The efferents therefrom return back to the vestibular nuclei.
From these nuclei, the vestibulospinal tract connects with the spinal
motor neurons.
Control of Muscle Tone and Stretch Reflexes
The medial part of anterior lobe of cerebellum inhibits the muscle tone (stretch reflex);
whereas the lateral parts of the anterior lobe
facilitates the muscle tone.
In normal man, the influence of the cerebellum on the muscle tone and stretch reflexes is inhibitory.
However, hypotonia is characteristic
of cerebellar lesion.
Control of Movements
The cerebellum does not initiate movements,
rather it coordinates movements
that are initiated in the motor system.
Coordination of movements is the result of appropriate regulation of
time, rate, range (extent) force and direction of muscular activity.
This is made possible because the cerebellum establishes reciprocal connections
with most of the regions of the CNS to which it is
connected.
Cerebellum controls both
involuntary and
voluntary movements.
Other Functions
Pyramis
is concerned with movement of eyeball
because its stimulation
causes upward eye movements to the
ipsilateral side.
It is also concerned with judgement of distance.
2.Uvula
it has vestibular function
Paraflocculus
developed in aquatic diving animals,
plays important role in
extensive reflex adjustment necessary for diving.