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Flashcards in Brainstem Deck (30)
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1

Radicular arteries feed into

the spinal arteries

2

Cerebellar peduncles are on _____ and are not seen ____

each side of midline, not seen in sagittal (midline) sections

3

Cerebellar peduncles connect

the cerebellum with other parts of
the brainstem

4

Instructions to motor neurons are
carried from the brain by

descending tracts

5

The corticospinal tracts arise in the
_______ and end in the____ (after crossing the midline).

Cerebral cortex, spinal cord

6

Why do both motor and sensory tracts decussate?

Each side of the brain controls the other side of the body

7

Degenerate corticospinal tracts are replaced by

Astrocytes

8

Corticospinal and rubrospinal tract similarities

Both tracts are dorsal to the denticulate ligament
-> voluntary movement
-> descending

9

Corticospinal and rubrospinal tract differences

1. Rubrospinal tract synapses at red nucleus
2. Rubrospinal has fewer axons
3. Corticospinal tract modulates sensory info

10

The corticospinal tracts arise from

neurons in the cerebral cortex and pass down the brainstem near its ventral surface

11

Corticopontine fibres

information from cerebral cortex via pons to cerebellum

12

The basilar artery supplies

the pons

13

Locked in syndrome occurs when

a branch of the basilar artery supplying the
corticospinal tracts is blocked

14

In the open medulla what structure is noted

Olives

15

In a section of closed medulla we see

Central canal and pyramids

16

How do Primary afferent fibres in peripheral
nerves carry sensory information to the
spinal cord ?

Through dorsal root

17

Dorsal root ganglion contains cell bodies of

sensory neurons

18

1a fibre function

Monitors muscle stretch speed changes

19

C fibre function

pain

20

Abeta function

position

21

General pattern of somatosensory tracts

1. Primary sensory neurones
2. Second order neurones on same side of CNS
-> cross midline
3. Neurons in thalamus send signals to somatosensoy cortex

22

Two important somatosensory pathways in the spinal cord are? and their functions?

1. Spinothalamic tract: nociception(pain); temperature; touch
2. Dorsal column/ medial lemniscus system: two point discrimination; conscious prioprioception; vibration sense

23

Outline spinothalamic tract pathway

1. Starts cerebral cortex
2. Synapse in thalamus
3. Axon in spinothalamic tract
4. Synapse in superficial dorsal horn of SC
5. Primary afferent to skin/muscle

24

Outline dorsal column/ medial lemniscus system pathway

1. Starts cerebral cortex
2. Synapse in thalamus
3. Axon in medial lemniscus
4. Synapse in medulla -> second order neuron in dorsal column nucleus
5. Axon in dorsal column until large primary afferent in drg reaches skin

25

Lumbar cord gives rise to

lumbar spinal nerves mainly for lower limbs

26

c fibres (nociceptive) end in

the superficial dorsal horn

27

Second order neurons have axons that cross the midline to

join the spinothalamic tracts

28

Fasciculus gracilis carries information from what part of the body?

from the middle thoracic and lower limbs of the body

29

Where are the lower limb fibres in the medial lemniscus?

lateral mid-pons/ mid brain

30

Which structure in the midbrain has descending control over pain?

Periaqueductal grey