cerebellum Flashcards
function of cerebellum in general
integrates sensory/other inputs from the brain and SC
coordinates ongoing movements and functions in motor planning
does the cerebellum have direct connections to the LMN
no
what divides the 2 cerebellar hemispheres
vermis
what divides the anterior and middle/posterior lobe of the cerebellum
primary fissure
this herniate through the foramen magnum if intracranial psi in inc
cerebellar tonsil
3 main lobes of the cerebellum
anterior, middle and flocculonodular
this is situated betw primary and uvulonodular fissures
middle lobe
this is situated posterior to uvulonodular fissure
flocculonodular lobe
it separates the cerebellum into superior and inferior surfaces
horizontal fissure - along the margin
what are the 3 functional subdivisions of the cerebellum
vermis
flocculonodular lobe
cerebellar hemis - intermediate and lateral zone
function of vermis
influences movement or coordination of neck, shoulder, thorax, abdomen and hips
function of flocculonodular lobe
balance and vestibulo-ocular reflex
function of intermediate zone
controls coordination or muscles of distal part of limbs
function of lateral zone
planning of sequential movements of entire body; conscious assessment of movement errors
area immediately lateral to the vermis
intermediate zone
motor pathway influenced by lat hemisphere
lateral corticospinal
motor pathway influenced by intermediate hemisphere
lateral corticospinal and rubrospinal
motor pathway influenced by vermis
anterior corticospinal
reticulospinal
vestibulospinal
tectospinal
motor pathway influenced by flocculonodular lobe
medial longitudinal fasciculus
separates middle lobe from flocculonodular lobe
uvolunodular fissure - ventroinferior surface
white and gray matter distrib of cerebellum
outer gray (cortex) tas inner white c intracerebellar nuclei
what does each folium or fold contain
core of white matter covered in gray matter
small ridges that run from medial to alt surface of cerebellum
folia
layers of cerebellar cortex from outer to inner
molecular
purkinje
granular
2 types of neurons found in the molecular layer
outer - stellate
inner - basket
these cells are scattered among dendritic arborizations and numerous thin axons that run parallel to long axis of folia
stellate and basket
unmyelinated granule axons and purkinje dendrites
what is found in the purkinje layer
purkinje cells - golgi type 1
exp the path of purkinje dendrites
dendrites pass into molecular layer tas dun sila mag branch out
then spines from synapses c parallels granule cell axons