B5 CNS: Anatomy of the Sensory Nervous System Flashcards Preview

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Flashcards in B5 CNS: Anatomy of the Sensory Nervous System Deck (58):
1

What are the functions of the sensory nervous system?

Collecting information (stimuli) from internal and external environment
Integrating, interpreting and assessing collected information

2

Which spinal cord root is purely sensory?

Dorsal

3

What is a ramus in relation to the CNS?

The branching of a spinal nerve after the anterior and posterior roots have combined to form a single nerve

4

Where does the spinal cord end?

L1-L2

5

What does the spinal cord taper off into?

Cornus

6

What structure is responsible for the tapering of the terminal portion of filum?

Pia mater

7

Where is the white matter on the spinal cord?

Outside region

8

Is the vagus nerve a cranial nerve?

Yes

9

What is the point of plexuses?

To redistribute nerves more efficiently

10

Give an example of a plexus?

C3-C5 (Phrenic nerve)
Brachioplexus- plexus from neck

11

What is a myotome?

Section of muscle innervated by a spinal nerve

12

What is a dermotome?

Section of skin innervated by a spinal nerve

13

With reference to the CNS, what are synonyms for 'sensory'?

Afferent
Ascending

14

What is the difference between a fasiculus and a lemniscus?

Nothing

15

What is the difference between a lemniscus and a peduncle?

Nothing

16

What are synonyms for 'tract'?

Fasiculus
Lemniscus
Peduncle

17

What are tracts?

Bundles of axons

18

Between white matter and grey matter, where would you expect to find tracts?

White matter

19

What are ganglia?

Collections of cell bodies

20

What is the difference between a bipolar and unipolar neuron?

Bipolar - Two axons off of the cell body

Unipolar- One axon attached to a cell body/ One axon that splits into two off the cell body

21

Where would you find the majority of pyramidal neurons?

CNS

22

What are the most medial fibres of the dorsal column?

Gracile nucleus

23

What are the most lateral fibres of the dorsal column?

Cuneate nucleus

24

Of the nuclei in the dorsal column, which one is responsible for innervating the lower limbs?

Gracile

25

What are the lateral spinothalamic pathways responsible for?

Pain & Temperature

26

What are the anterior spinothalamic pathways responsible for?

Crude touch

27

What tracts are responsible for unconscious perception?

Spinocerebellar

28

Which tracts are responsible for conscious perception?

Spinothalamic
Dorsal column- medial lemniscus

29

What lobe of the brain is most concerned with vision?

Occipital

30

How many sagittal zones does the cerebellum have?

3

31

How many lobes does the cerebellum have?

3

32

What are the most anterior bits of the cerebellum?

Flocculus and nodules

33

What are the little bumps on the cerebellum called?

Folia

34

How many deep cerebellar nuclei are there?

4

35

From most lateral to most medial, what is the order of the deep cerebellar nuclei?

DGEF

36

What are the two nuclei between the dentate and fastigal nuclei collectively known as?

Interpose nuclei

37

How is the body mapped on the cerebellar hemispheres?

Ipsilaterally

38

If a patient were to come in with right sided cerebellar problems, which side of their body would be affected?

Right

39

What roles does the cerebellum have?

Unconscious proprioception
Constant feedback and improvement of movement
Balance

40

What motor pathway can the cerebellum bypass?

Corticospinal

41

What nuclei are responsible for the cerebellum being able to bypass a descending pathway?

Tranverse nuclei of pons

42

Where are sympathetic neurones always found?

Craniosacrally

43

Where are parasympathetic neurones always found?

Thoracolumbarly

44

What are splanchnic nerves?

Nerves that act parasympathetic.

45

What are the properties of thoracic splanchnic nerves?

Pre-gangionic
Tend to run to the gut

46

Where do the great splanchnic nerves run from?

T5-T9

47

Where do the lesser splanchnic nerves run from?

T10-T11

48

Where do the least splanchnic nerves run from?

T12

49

What are the properties of sympathetic nerves?

Thoracolumbar
Paravertebral + Prevertebral ganglia
Relatively long

50

What are the properties of parasympathetic nerves?

Craniosacral
Terminal Ganglia
Relatively short

51

How much longer are the sympathetic post ganglionic neurones in comparison to the pre ganglionic neurones?

17 times longer

52

How much longer are the parasympathetic post ganglionic neurones in comparison to the pre ganglionic neurones?

Twice as long

53

What does the sympathetic nervous system innervate?

Virtually everything

54

What does the parasympathetic nervous system innervate?

Mainly visceral organs

55

What structures in the nervous system are responsible for mediating reflexes?

Spinal cord
Brainstem medullary centres

56

List examples of polysynaptic visceral reflexes?

Gastric and Intestinal Swallowing

57

What is the autonomic innervation of the bladder?

Balance between sympathetic and parasympathetic supply
Sympathetic supply to parasympathetic endings turns off parasympathetics

58

What controls whether sympathetic presynaptic ganglions inhibit parasympathetic endings?

Urination centre in pons