12-9 Cerebellum

Question 1

A: Job of the Cerebellum?

B: After leaving from [Deep Cerebellar Nuclei], Cerebellar Efferents may travel to the ___, _____, _____ and ______

C: There is NO DIRECT connection from Cerebellum to __ ____

Answer 1

A: Coordinates & Corrects current movements to match those INTENDED

B: After leaving from [Deep Cerebellar Nuclei], Efferents travel to the Thalamus, [Red Nucleus of Midbrain], [Vestibular Nuclei complex] and [MLF of midbrain]

C: There is NO DIRECT connection from Cerebellum to Spinal Cord

Question 2

A: Name the 3 [Deep CEREBELLAR nuclei] and List the Cerebellar parts they RECEIVE info from

B: Which part of the Brainstem has a lot of “Lumps and Bumps” on it?

Answer 2

A: Deep CEREBELLAR nuclei

1. Fastigial (Receives from Flocculonodular lobe)
2. Interposted (Receives from Vermis & Medial hemisphere)
3. Dentate (Receives from LATERAL hemisphere)
   - ————————————————————————————-B: MEDULLA

Question 3

A: What lobes does the [Primary Fissure] of the Cerebellum separates?

B: A: What lobes does the [HORIZONTAL Fissure] of the Cerebellum separates?

Answer 3

Cerebellum
A: Primary Fissure= Separates ANT cerebellar lobe from POST cerebellar lobe
————————————————————————————–
B: Horizontal Fissure = Separates UPPER and LOWER portion of Cerebellum

Question 4

A: [inferior Cerebellar Peduncle] (ICP) RECEIVES AFFERENT signals from what 3 things?

B: [inferior Cerebellar Peduncle] (ICP) SENDS these AFFERENT signals to the ___ & _____ ____

C: [inferior Cerebellar Peduncle] (ICP) EFFERENTS travel to the ___ nuclei

Answer 4

A: [inferior Cerebellar Peduncle] (ICP) RECEIVES AFFERENT signals from the…

1. [Vestibular/Cochlear nuclei]
2. Inferior olivary nucleus of (rostral medulla)
3. Dorsal Spinocerebellar & cuneocerebellar tracts

B: [inferior Cerebellar Peduncle] (ICP) SENDS EFFERENT signals to the Vermis & Flocculonodular lobe

C: [inferior Cerebellar Peduncle] (ICP) EFFERENTS travel to the [Vestibular/Cochlear Nuclei]

Question 5

A: [Middle Cerebellar Peduncle] (MCP) RECEIVES AFFERENT signals from the _____ which travels to the ___nuclei first in order to get to the MCP

B: [Middle Cerebellar Peduncle] (MCP) SENDS these signals to the _______

Answer 5

A: [Middle Cerebellar Peduncle] (MCP) RECEIVES AFFERENT signals from the…
1. Cortex—>Pontine nuclei–>MCP

B: [Middle Cerebellar Peduncle] (MCP) SENDS these signals to the HUGE Lateral Cerebellar hemispheres

Question 6

A: **[SUPERIOR Cerebellar Peduncle] (SCP) ONLY RECEIVES 1 AFFERENT signal from the______

B: The SCP are MOSTLY EFFERENTS that originate from ____ ___ _____ nuclei and travel to ___ and __ ____

Answer 6

A: [SUPERIOR Cerebellar Peduncle] (SCP) ONLY RECEIVES 1 AFFERENT signal from the [Ventral Spinocerebellar Tract]

B: The SCP are MOSTLY EFFERENTS that originate from [Dentate DEEP Cerebellar nuclei] and travel to Thalamus and Red Nucleus

Question 7

Once Afferent information gets to [Flocculonodular Lobe] from (___) , it’ll send signals to [_____ nucleus] —–>_____ & _______= coordinates eye movements with ________ movements

Answer 7

Once Afferent information gets to [Flocculonodular Lobe] from (ICP) , it’ll send signals to [Fastigial nucleus] —–>[Vestibular/Cochlear nuclei] &[MLF of midbrain] = coordinates eye movements with head & neck movements

Question 8

____ & ______ of the Cerebellum send information to the [Interposed Cerebellar nucleus], which sends fibers to the ______ and it—(decusates)—->to form the ______ tract

Answer 8

Vermis & [Medial Cerebellum hemisphere] correspond with the [Interposed nucleus] (Glubose-emboliform) —->[Red Nucleus of midbrain prt 1] —(decusates)—->Rubrospinal tract

Question 9

[Lateral Cerebellum hemispheres] correspond with the ____ nucleus —-(to 2 structures)—>
1. _______ —->(decusates)—>projects down to _______–>
(uses ___ _____)—->____ ___ _____—> [__ ____ nuclei]

2. …also goes to _____ —> CEREBRAL Cortex

Answer 9

[Lateral Cerebellum hemispheres] correspond with the Dentate nucleus —-(to 2 structures)—>

1. [Red Nucleus of Midbrain prt 2] —->(decusates)—>projects down to [inf olivary nucleus]–>(climbing fibers)
   - —>[Inhibitory Purkinje Cells]—> [DEEP Cerebellar nuclei]
2. also goes to Thalamus —> Cerebral Cortex

Question 10

Cerebellar ___ and ____ hemispheres are responsible for coordinating TRUNK Muscles
vs.
Cerebellar ____ hemispheres are responsible for LIMBS (Feet & hand) Muscles

Answer 10

Cerebellar Vermis and Medial hemispheres are responsible for coordinating AXIAL/TRUNK Muscles
vs.
Cerebellar Lateral hemispheres which are responsible for LIMBS (Feet & hand) Muscles

Question 11

Cerebellum is made of 3 Layers:

1. [Outer Molecular layer] is mainly __ & ____. It has ___ cells (?) and ____ cells (?)
2. Describe the [Purkinje layer]
3. Describe the [inner Granular Layer]

Answer 11

Cerebellum is made of 3 Layers:
1. [Outer Molecular layer] which is mainly Axons & Dendrites. It has Basket cells (axons synapsing on Purkinje Bodies) and Stellate cells (axons synapsing on Purkinje Dendrites)

2. Purkinje layer = AXON leaving cerebellum
   - ————————————————————————————-
3. [inner Granular Layer] = has white mater underneath

Question 12

A: What are Mossy Fibers?

B: What is their route of Passage
Mossy Fibers—> ______Cell —–> ______ ____
—->LIGHTLY innervate ____ ___ ____—–> ____ ___ _____

Answer 12

A: Mossy Fibers = Any Cerebellar fiber NOT FROM [inf olivary nucleus] that travels to Cerebellar [Inhibitory Purkinje cells]

B: Mossy Fibers—>Granule Cell—(bifurcates)—>Parallel fibers –>LIGHTLY innervate many [Inhibitory Purkinje cells]
—-> [Deep Cerebellar Nuclei]