Lecture 3- The Cerebellum Flashcards Preview

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Flashcards in Lecture 3- The Cerebellum Deck (57):
0

Where is the cerebellum located?

Posterior cranial fossa, under tentorium cerebelli, Posterior/ superior border of the 4th ventricle

1

Two other ways it differs from the cerebral cortex

1. None of its activity directly contributes to consciousness
2. Its hemispheres possess ipsilateral ( same side) representation of body parts.

2

The cerebellum has lots more ........, compared to the cerebral cortex and therefore has lots of .....?

Grey matter
Cell bodies

3

The cerebellum is very small at birth but develops rapidly in the
first ............

Six years

4

At ages 1-6 the Cerebellum codes movement sequences of what?

running, climbing, jumping

5

The cerebellum develops from the?

Mesencephalon

6

The cerebellum forms the roof of which ventricle?

Fourth ventricle

7

The cerebellum is Separated from occipital and temporal lobes by
the?

tentorium cerebelli

8

The cerebellum consists of folia and fissures on its?

surface

9

The cerebellum is made up of two lateral lobes which are called?

cerebellar hemispheres

10

The cerebellum is 10% of total brain mass, but contains ....... of total neurons?

50%

11

The cerebellum is part of which system. E.g sensory or motor?

Motor

12

Cerebellum indirectly affects movements on which side of the body?

Ipsilateral (same side)

13

The anterior lobe of the cerebellum is located where?

Anterior to primary fissure

14

The cerebellum has inputs from the ............, so it can monitor the
position of body in space

Vestibular system

15

Functions of the cerebellum
• Three primary functions:

1. maintenance of posture and balance

2. maintenance of muscle tone

3. Coordinates smooth movements by influencing timing and force of contractions of voluntary muscles.

16

What is the function of the anterior lobe of the cerebellum?

Maintains coordination of limb movements while movements are being executed

17

The anterior lobe receives input from what three things?

limb (chiefly lower limb)
muscle spindles (stretch receptors)
Golgi tendon organs via the spinocerebellar tracts

18

The anterior lobe has a role in regulating what?

Muscle tone

19

The Flocculonodular lobe consists of what two structures?

1. nodulus (of the vermis)
2. flocculus (most ancient part of cerebellum)

20

The Flocculonodular lobe receive input from the?

vestibular system so it can monitor the position of the body in space

21

The Flocculonodular lobe play a role in maintenance of what three things?

1.Balance
2.Posture
3 Eye movement

22

The posterior lobe lies between the primary fissure and the?

posterolateral fissure

23

The posterior lobe receives massive input from the?

Cerebral cortex

24

The posterior lobe plays a role in co-ordination of?

Voluntary motor activity

25

The posterior lobe stores all sequential components of?

skilled movements

26

Functions of cerebellar peduncles

Tracts of afferent & efferent axons enter or leave
the cerebellum through the cerebellar peduncles

27

Superior cerebellar peduncle: connects cerebellum to?

pons and midbrain

28

Middle cerebellar peduncle: connects the cerebellum to the?

Pons

29

Inferior cerebellar peduncle: connects the cerebellum to the?

Medulla

30

Superior cerebellar peduncle: contains mostly ....... (“going out”) tracts from ........?

Efferent
Cerebellar nuclei

31

Middle cerebellar peduncle: contains only ........... (“coming in”) tracts

Afferent

32

Inferior cerebellar peduncle: contains ......... ..........tracts

Afferent and efferent tracts from spinocerebellar tracts

33

Superior cerebellar peduncle, Efferent: travel from?

Cerebellum to midbrain

34

Middle cerebellar peduncle Afferent: travel from

Pons to cerebellum

35

Inferior cerebellar peduncle Afferent & efferent: between the?

cerebellum and medulla oblongata

36

The efferent system travels from the cerebellum to the thalamus (thalamic nuclei) and then to the?

Prefrontal cortex

37

The affording system travels from the prefrontal cortex, to the pons (pontine nuclei) and then to the?

Cerebellum

38

The afferent tracts :
Dorsal spinocerebellar tract: carries proprioceptive information from ....…..and tendon organs of individual lower limb
muscles to the ..........via the.........

Muscle spindles
Cerebellum
Inferior cerebellar peduncle

39

Afferent tracts:
Cuneocerebellar tract: carries equivalent information from ...........which also enters via .........?

Upper limb
Inferior cerebellar peduncle

40

Afferent tract
Trigeminocerebellar tract: carries info from ......, masticatory and external ocular muscles

TMJ

41

Afferent tract
Ponto-cerebellar tract: carries info from ........... to cerebellum through ....................?

Motor cortex
contralateral middle cerebellar peduncle

42

Affording tract
Vestibulocerebellar tract: vestibulocerebellar impulses from ............... carry info about position and movement of ...... and enter cerebellum through ...........?

Vestibular nuclei
Head
Inferior cerebellar peduncle

43

The cerebellar nuclei Contain most of the cell bodies of ............ neurons of the cerebellum

Efferent

44

Cerebellar nuclei receive projections from........... cells in
cerebellar cortex.

Purkinje

45

Four nuclei containing most of efferent neurons:

• Dentate nucleus
• Emboliform nucleus
• Globose nuclei
• Fastigial nucleus

46

The Emboliform nucleus and the Globose nuclei form the?

Interposed nuclei

47

Dentate nucleus is the most lateral and largest – input
from ............?

lateral parts of hemispheres

48

Fastigial nucleus is most medial – input from ?

vermis & flocculonodular lobes

49

Cerebellar nuclei project to motor centres of the ........., brainstem and .........?

Thalamus
Spinal cord

50

The cerebellar cortex has three layers, what are these?

• Molecular layer (outer layer)
• Purkinje cell layer
• Granular layer

51

The cerebellum is supplied by which three arteries?

• Posterior inferior cerebellar artery (PICA)

• Anterior inferior cerebellar artery (AICA)

• Superior cerebellar artery (SCA)

52

Does the cerebellum initate movements?

No

53

What type of fibres (afferent/efferent) does the superior cerebellar peduncle carry?

Efferent

54

What type of information does the spinocerebellar tract carry

Afferent

55

Which is the most superficial layer of the cerebellar cortex?

Molecular

56

Which is the largest cerebellar nucleus?

Denate