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Anterior lobe of cerebellum function
regulates unconscious proprioception
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Cerebellum Posterior lobe function
- "Neocerebellum"
- It mediates fine motor cordination
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Flocculonodular lobe of cerebellum
- Made up of the nodulus and flocculus
- vestibulocerebellum
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Vermis
joins the cerebellar hemispheres; site of termination of the spinocerebellar tracts
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Primary fissure of cerebellum
divides the cerebellum into anterior and posterior parts
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Horizontal fissure
divides the cerebellum into superior and inferior parts
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Superior medullary velum
White matter lamina that acts as the roof of the 4th ventricle
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Superior cerebellar peduncles
"Brachium Conjunctivum" - carry bundle of fibers from midbrain and pons to the cerebellum
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Middle cerebellar peduncles
"Brachium pontis" carry fibers mostly from pons to the cerebellum
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inferior cerebellar peduncles
- "Restiform body"
- carry fibers from the medulla and spinal cord to the cerebellum
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Cerebellar Nuclei
receive input from the cerebellar cortex and they represent the output of the cerebellum
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arbor vitae
arrangement of cerebellar gray and white matter.
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Where is the corpora quadrigemina located?
in the tectum of the midbrain
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What forms the corpora quadrigemina?
The superior colliculi and inferior colliculi
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What does the superior colliculus do?
receives visual input and is involved in ocular motor control
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Inferior colliculus
receives auditory input from the brain stem and auditory cortex
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What connects the colliculi with the thalamus?
the brachia of superior and INF colliculi
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CN IV
purely motor; supplies the superior oblique muscle
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Crus Cerebri
- located anterior to cerbral peduncles
- contains motor tracts
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interpeduncular fossa location
space between the cerebral peduncles;
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What emerges from the interpeduncular fossa?
CN III emerges from it
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CN III Innvervation
- Motor - levator palpedbrae superiori, INF rectus, MED rect, SUP rectus, and INF oblique
- Parasympathetic to: pupillary constriction and lens accomodation.
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Pons
contain multiple nuclei that regulate sensory and motor innervation to the face; involved in breathing, swallowing, auditory input, balance, sleep / consciousness
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CN V
- arises from mid pons
- sensory fibers to the face
- motor fibers muscles of mastication
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Dorsal median sulcus
posterior groove in closed medulla
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medial eminence
elevation in the Rhomboid fossa
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Facial colliculus
dorsal elevation formed by the facial nerve looping around the abducens nerve inside the pons
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Vestibular area
dorsal elevation formed by the presence of the vestibular nuclei inside the pons
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stria medullares
portion of CN VIII that crosses the acoustic area
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Sulcus limitans
marks the lateral boundary of the rhomboid fossa in proximity of the locus ceruleus
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Pontomedullary junction
fissure marking the separation of the pons from the medulla oblongata; point of exit of cranial nerves VI, VII, and VIII
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Pyramid
Elevation located in the superoanterior aspect of the medulla site of corticospinal tract decussation
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Olive
- elevations located lateral to the pyramids
- involved in control of movement
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Cuneate tubercle and fasciulus
part of dorsal column system; carries proprioception and touch from upper body
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Gracile tubercle and fasciculus
- Part of dorsal column system;
- carries proprioception and touch from lower body
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Vagal trigone
Eminence inthe Rhomboid Fossa Formed by CN X
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Hypoglossal trigone
eminence in the rhomboid fossa formed by CN XII
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Obex
Most inferior point of the IV ventricle as it becomes the central canal
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Dorsal Median sulcus
shallow groove located in posterior closed medulla.
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