Ascending Sensory Pathways Flashcards Preview

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Flashcards in Ascending Sensory Pathways Deck (37):
1

What type of information does the spinothalamic tract carry?

Crude touch, temperature, pressure and pain

2

Which sensory tract uses thin, poorly myelinated axons?

Spinothalamic

3

Which sensory tract uses thick, well myelinated axons?

Dorsal column

4

Does the spinothalamic pathway use fast or slow conduction?

Slow

5

Does the spinothalamic pathway run contralaterally or ipsilaterally in the spinal cord?

Contralaterally

6

Where do the primary neurons of the spinothalamic tract synapse?

Dorsal grey horn

7

Where do the secondary neurons of spinothalamic tract cross the midline?

Ventral white commissure (just anterior to central canal)

8

What is the spinothalamic tract called when it reaches the brainstem?

Spinal lemniscus

9

Where does the secondary neuron of the spinothalamic tract synapse?

Ventral posterolateral nucleus of the thalamus

10

What information passes through the medial VPL of the thalamus?

Sensory information from arm

11

What information passes through lateral VPL of the thalamus?

Sensory information from leg

12

Where do tertiary neurons of the spinothalamic tract terminate?

Primary somatosensory cortex

13

What type of information does the dorsal column pathway carry?

Discriminative touch, vibration and proprioception

14

Does the dorsal column pathway use fast or slow conduction?

Fast

15

Does the dorsal column pathway run contralaterally or ipsilaterally in the spinal cord?

Ipsilaterally

16

Where does the dorsal column pathway ascend in the spinal cord?

Ipsilateral gracile or cuneate fascicle

17

In the medulla, what are the gracile and cuneate fascicles renamed to?

Gracile and cuneate tubercles

18

Where do the primary neurons in the dorsal column pathway synapse?

Gracile/cuneate tubercle

19

Where do the secondary neurones of the dorsal column pathway cross the midline?

Internal arcuate fibres in medulla

20

Where do the secondary neurons of the dorsal column pathway ascend?

Medial lemniscus

21

Where do the secondary neurons of the dorsal column pathway synapse?

Ventral posterolateral nucleus of thalamus

22

Where do the tertiary neurons of dorsal column pathway project to?

Primary somatosensory cortex

23

In which pathway does sensation from the head travel?

Trigeminothalamic pathway

24

What facial sensation does trigeminal nerve carry?

General sensory from face, scalp and dura

25

What facial sensation travels in facial nerve?

External ear sensation

26

What facial sensation travels in glossopharyngeal nerve?

Sensation from posterior 1/3 of tongue, pharynx and middle ear

27

What facial sensation travels in vagus nerve?

Sensation from auditory canal, larynx, pharynx and oesophagus

28

What are the subdivisions of the trigeminal nucleus?

Mesencephalic, pontine/principal sensory and spinal

29

Which part of the trigeminal nucleus receives pain and temperature?

Caudal part of spinal nucleus

30

Which part of the trigeminal nucleus receives simple touch and pressure?

Rostral part of spinal nucleus

31

Which part of the trigeminal nucleus receives discriminative touch?

Pontine/principal sensory nucleus

32

Which part of the trigeminal nucleus receives proprioception?

Mesencephalic nucleus

33

In which pathways do the axons descend before ascending?

Trigeminothalamic
- pain and temperature
- touch and pressure

34

Where do fibres in the trigeminothalamic pathway descend?

Spinal tract

35

Where does information travelling in the trigeminothalamic pathway go to in the thalamus?

Ventral posteromedial nucleus

36

In which trigeminothalamic pathway are the primary neuron cell bodies not in their respective cranial nerve ganglia?

Proprioception pathway - cell bodies in mesencephalic nucleus

37

What reflex is associated with the proprioception pathway of the trigeminothalamic tract?

Jaw jerk reflex