The Cerebellum Flashcards
What is the vermis?
A narrow worm-like structure found between the two hemispheres of the cerebellum
What is the horizontal fissure?
This fissure marks the lateral and posterior margins of the hemisphere
What is the primary fissure?
This fissure marks the division between the anterior and posterior lobes of each cerebellar hemisphere
What is the tonsil?
A prominent rounded swelling of the cerebellar cortex anteriorly on either side of the vermis
What is the flocculus?
An ovoid shape with a crinked edge which lies immediately posterior to the lateral foramen of the 4th ventricle on each side partly covered by choroid plexus.
What is the nodule?
It is continuous with the flocculus via a peduncle of white matter
What is the flocculo-nodular lobe?
the flocculus and the nodule together, primarily concerend with vestibular information
What is the dentate nucleus?
The largest and most lateral of the deep cerebellar nuclei, a zig-zag edged oval mass with fibre bundles passing into the superior cerebellar peduncle
What is the rhomboid fossa?
The diamond shaped floor of the 4th ventricle limited laterally by the cerebellar peduncles and posterior by the gracule and cuneate tubercles
What is the median sulcus?
A sulcus that divides the rhomboid fossa into triangular left and right halves
What is the facial colliculus?
A rounded swelling caused by the fibres of the facial nerve in the substance of the pons curving round at the nucleus of the abducens nerve at the level of the superior fovea
What is the medullary striae?
Aberrant ponto-cerebellar fibres passing from the pons to the cerebellum. They divide the floor of the ventricle into a rostral pontine half and a caudal medullary half
What is the locus coeruleus?
A blue-ish grey-ish pigmented noradrenergic cells under the ependyma at the rostral half of the sulcus limitans
What is the hypoglossal trigone?
The medial triangular area overlying the hypoglossal nerve nucleus
What is the vagal trigone?
The intermediate triangular area overlying the vagus nerve nucleus
What is the vestibular trigone?
The lateral triagnular area overlying the vestibulocochlear nerve nucleus
What is the obex?
Inferior part of the rhomboid fossa
What is the area postrema?
A small tongue-shaped area immediately rostro-lateral to the obex- commonly associated with nausea control, a chemoreceptive trigger zone for the emetic response
