Lab 2: Cerebellum and Brainstem
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Anterior lobe of cerebellum function
regulates unconscious proprioception
Cerebellum Posterior lobe function
- It mediates fine motor cordination
Flocculonodular lobe of cerebellum
- Made up of the nodulus and flocculus
joins the cerebellar hemispheres; site of termination of the spinocerebellar tracts
Primary fissure of cerebellum
divides the cerebellum into anterior and posterior parts
divides the cerebellum into superior and inferior parts
Superior medullary velum
White matter lamina that acts as the roof of the 4th ventricle
Superior cerebellar peduncles
"Brachium Conjunctivum" - carry bundle of fibers from midbrain and pons to the cerebellum
Middle cerebellar peduncles
"Brachium pontis" carry fibers mostly from pons to the cerebellum
inferior cerebellar peduncles
- "Restiform body"
- carry fibers from the medulla and spinal cord to the cerebellum
receive input from the cerebellar cortex and they represent the output of the cerebellum
arrangement of cerebellar gray and white matter.
Where is the corpora quadrigemina located?
in the tectum of the midbrain
What forms the corpora quadrigemina?
The superior colliculi and inferior colliculi
What does the superior colliculus do?
receives visual input and is involved in ocular motor control
receives auditory input from the brain stem and auditory cortex
What connects the colliculi with the thalamus?
the brachia of superior and INF colliculi
purely motor; supplies the superior oblique muscle
- located anterior to cerbral peduncles
- contains motor tracts
interpeduncular fossa location
space between the cerebral peduncles;
What emerges from the interpeduncular fossa?
CN III emerges from it
CN III Innvervation
- Motor - levator palpedbrae superiori, INF rectus, MED rect, SUP rectus, and INF oblique
- Parasympathetic to: pupillary constriction and lens accomodation.
contain multiple nuclei that regulate sensory and motor innervation to the face; involved in breathing, swallowing, auditory input, balance, sleep / consciousness
- arises from mid pons
- sensory fibers to the face
- motor fibers muscles of mastication
Dorsal median sulcus
posterior groove in closed medulla
elevation in the Rhomboid fossa
dorsal elevation formed by the facial nerve looping around the abducens nerve inside the pons
dorsal elevation formed by the presence of the vestibular nuclei inside the pons
portion of CN VIII that crosses the acoustic area
marks the lateral boundary of the rhomboid fossa in proximity of the locus ceruleus
fissure marking the separation of the pons from the medulla oblongata; point of exit of cranial nerves VI, VII, and VIII
Elevation located in the superoanterior aspect of the medulla site of corticospinal tract decussation
- elevations located lateral to the pyramids
- involved in control of movement
Cuneate tubercle and fasciulus
part of dorsal column system; carries proprioception and touch from upper body
Gracile tubercle and fasciculus
- Part of dorsal column system;
- carries proprioception and touch from lower body
Eminence inthe Rhomboid Fossa Formed by CN X
eminence in the rhomboid fossa formed by CN XII
Most inferior point of the IV ventricle as it becomes the central canal
Dorsal Median sulcus
shallow groove located in posterior closed medulla.
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