Cerebellum and third and fourth ventricles Flashcards
What is midline of cerebellum?
Vermis
Whats the name of the individual ridges on cerebellum?
Folia
Each hemisphere of cerebellum has two lobes. What are they?
Anterior and posterior lobe
What are two lobes of cerebellum separated by?
Primary fissure
What is the third cerebellar lobe and what is its role?
Flocculonododular lobe
- balance
How is cerebellum connected to medulla, pons and midbrain?
Inferior, middle and superior cerebellar peduncles
What are the three main inputs to the cerebellum?
Corticopontine from primary motor cortex via middle cerebellar peduncle
Vestibular via inferior cerebellar peduncle
Spinal sensory via superior (contralateral) and inferior (ipsilateral) cerebellar peduncles
what is the largest of the deep cerebellar nuclei?
dentate nuclei
where does dentate nuclei output to?
superior cerebellar peduncles
role of dentate nucleus?
planning, initiation and control of movment
whats the names of the two more medial deep cerebellar nuclei?
vestigal nuclei
interpose nuclei
which is the most medial deep cerebellar nuclei?
vestigal
what are the outputs of dentate nuclei?
Red nucleus -> thalamus
What parts of cerebellum are important in motor planning?
Corticoponitne inputs to lateral hemispheres
- output via dentate to thalamus and motor/premotor cortices
- learned and skillful movements
-known as cerebrocerebellum
what parts of cerebellum are imporntant for motor execution?
vermis and medial regions
- output via fastigal and interposed nuceli
-axial control and gait
- known as spinocerebellum
what parts of cerebellum important ofr balance and eye movement?
flocculonodular lobe and vermis
- outputs to vestibular nuclei
- known as vestibulocerebellum
whats the name of the floor of the 4th ventricle?
rhomboid fossa
what is locus coerulus?
pigmented noradrenergic neurons
- stress responses and arousal
what is the inferior tip of rhomboid fossa called?
obex
what is area postrema important for?
- nausea
-chemodetector zone
what is facial colliculus?
in pontine region
- swelling caused by fibres of cranial nerve 7 (facila)
what is the medullary striae?
where pontocerebellar fibres pass from pons to medullar
what are the 3 trigones?
hypoglossal (overlies 11th nerve)
vagal (0verlies 10th nerve)
vestibular (overlies 8th nerve)
what separtes lateral venticles?
septum pallucidum
what is intraventicular foramen?
connects lateral and third ventricles
what forms anterior wall of third ventricle?
lamina terminalis
what is the paracentral lobule?
U shaped gyrsu surrounding the mdeial extenstion of central sulcus
- representations of lower limbs in primary motor and somatosensory areas of cortex
what are the gracile tubercles (fasciculi)?
dorsal column carrying touch vibration, two-point discrimination and proprioception form the lower limb
what are the cuneate tubercles (fasciculi)?
dorsal columns carrying touch vibration, two-point discrimination and proprioception from the upper limb
what is the striae of genari?
white band in the primary visual cortex
in the primary motor and primary somatosensory areas, what is found medially and laterally?
medially: leg, arm, neck
laterally: lips, fingers
what is the interthalamic adhesion?
grey disc joining the thalami on each side behind the intraventricular foramen (may be absent)
what is the left hemisphere dominant for?
verbal
linguistic description
maths
sequential
analytical
direct link to ‘consciousness’
