Pons and Cerebellum Flashcards Preview

Term IV: Neuro > Pons and Cerebellum > Flashcards

Flashcards in Pons and Cerebellum Deck (29):
1

Motor functions of cerebellum:

1. Motor coordination
2. Motor learning
3. Balance
4. Posture
5. Proprioception - understanding of where your limbs are with respect to space

2

Non-motor functions of cerebellum:

1. Blood pressure
2. Breathing rhythm
3. Cognition (esp emotion)
4. Language

3

Where are more than half of the neurons in the brain located?

Cerebellum

4

One word to describe what cerebellum does?

PREDICTION

5

Three lobes of cerebellum

Anterior, Posterior, Flocculonodular

6

Maintenance of balance, control of eye movements

Part of cerebellum that controls it and which predominant lobe?

Vestibulocerebellum - mostly flocculo-nodular lobe

7

Regulation of muscle tone, coordination of skilled voluntary mvt

Part of cerebellum that controls it and which predominant lobe?

Spinocerebellum - mostly anterior lobe

8

Planning of voluntary activity

Part of cerebellum that controls it and which predominant lobe?

Cerebrocerebellum - Posterior Lobe

9

4 pairs of cerebellar nuclei? What do they do?

FGED - fat guys eat donuts

Fastigial
Globose
Emboliform
Dentate

They connect cerebellum to rest of brain and spinal cord

10

Cerebellum is connected to brain stem by 3 peduncles on each side. What are they called and what do they connect?

1. Superior cerebellar peduncle - cerebellum w/ midbrain
2. Middle cerebellar peduncle - cerebellum w/ pons
3. Inferior cerebellar peduncel - cerebellum w/ medulla oblongata

11

What are the three layers of the cerebellar gray matter?

1. Molecular
2. Purkinje cell
3. Granular

12

What are the 5 types of neurons in the cerebellar cortex?

1. Purkinje cells
2. Golgi cells
3. Stellate cells
4. Basket cells
5. Granule cells

13

What are two main types of afferents in cerebellar cortex?

1. Mossy fibers
2. Climbing fibers

14

What is the single efferent cell in the cerebellar cortex?

Purkinje cell axons

15

Name that cerebellar cortex neuron!

- Spontaneously active
- Inhibitory (GABAergic)
- Project out of cerebellar cortex to deep cerebellar and vestibular nuclei
- Main site of cerebellar computation

Purkinje cells

16

Name that cerebellar cortex neuron!

- Excitatory (glutamatergic) to Purkinje cells via parallel fibers
- Bifurcate
- Relay mossy fiber information to Purkinje cells

Granule cells

17

Name that cerebellar cortex neuron!

- Inhibitory (GABAergic)
- Spatial inhibition to Purkinje cells

Basket and Stellate cells

18

Name that cerebellar cortex neuron!

- Inhibitory (GABAergic)
- Temporal inhibition of mossy fiber input

Golgi cells

19

What are three major sources of inputs to cerebellum from CNS?

- Spinal cord - info related to position & condition of muscles, tendons, joints
- Vestibular system - related to body equilib
- Cerebral cortex - provide info for planning & initiation of mvt

20

Inputs in cerebellum are segregated within cerebellum into 3 fiber systems:

1. Climbing fiber system
2. Mossy fiber
3. Multilayered fiber

21

Name that cerebellar fiber system!

- Consists of the olivocerebellar tracts.
- Privileged interaction with Purkinje cells

Climbing fiber system

22

Name that cerebellar fiber system!

Includes all afferents which are not part of the climbing fiber & the multilayered fiber system

Mossy fiber system

23

Name that cerebellar fiber system!

Consists of the afferent from the hypothalamus, as well as the serotonergic input from the raphe nuclei, the noradrenergic input from the locus ceruleus, & the dopaminergic input from the
VTA

Multilayered fiber system

24

Major relay center for sensorimotor information, but also critical region for higher functions

Pons

25

Functions of pons:

1. Sleep
2. Arousal
3. Autonomic functions (respiration)
4. Major link between cerebral cortex and cerebellum

26

Two principle regions of pons:

1. Basis pontis - ventral

Corticospinal and corticobulbar tracts, pontine nuclei

2. Pontine tegmentum - dorsal

Nuclei of cranial nerves, reticular formation, resp centers

27

What cranial nerve nuclei are found in the pons?

5th, 6th, 7th, 8th

28

What functions are associated with serotonin system?

Circadian rhythms, alertness, pain modulation

29

What functions are associated with norepinephrine system?

Sleep-wake cycles, arousal, attention, memory